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Biology Flash Cards
RC Academy
205
Biology
7th Grade
05/16/2011

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Term

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What is Number 1

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Number 1 is an eyepiece.  There can be one or two (bi-ocular)

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What is number 2

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2

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What is number 3

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3

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What is number 4

Definition

4

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What is number 5

Definition

5

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What is Number 6

Definition

6

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What is number 7

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7

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What is number 8

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8

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What is number 9

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9

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What is number 10

Definition

10

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What is number 11

Definition

11

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What is number 12

Definition

12

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What is number 13

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13

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What is number 14

Definition

14

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What is number 15

Definition

15

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What is number 16

Definition

16

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Term
What four biotic factors affect population growth
Definition
Birthrate, deathrate, Immigration & Emigration
Term
What is exponential growth
Definition
A factor of population where the larger a population grows the faster it grows. The size of each generation of offspring will be larger than the one before it.
Term
What is logistic growth
Definition
when a population's growth slows and then stops, following a period of exponential growth
Term
List four characteristics that are used to describe a population
Definition
Geographic range, density & distribution, growth rate, age structure
Term
Geographic Range
Definition
Area inhabited by a population
Term
Population Density
Definition
Number of individualsnper unit area
Term
If a population's size staysthe same but its geographic range decreased what would happen to its density
Definition
Density would increase because there is less space for the existing ting population
Term
The number of individuals of a single species per unit area is known as
Definition
population density
Term
What are the three patterns of populatiion distribution that describe population density
Definition
Random, Uniform, & Clumped
Term
Growth Rate
Definition
How much time must pass before a generation is able to breed the next generation
Term
Age Structure
Definition
number of males and females of each age in a population
Term
What natural factors can change a population's size
Definition
Births, immigration, deaths, & emigration
Term
Movement of individuals into an area is called
Definition
Immigration
Term
Movement of individuals out of an area is called
Definition
emigration
Term
An s-shaped graph represents what type of population growth
Definition
Logistic Growth Curve Shape
Term
Describe logistic growth
Definition
Growth that occurs when a population's growth slows following a period of exponential growth and then stops at or nearthe carrying capacity
Term
In the presence of unlimited resources and in the absence of disease and predation, what would probably happen to a bacterial populations growth
Definition
Exponential Growth
Term
A population graph shaped like a "J" represents what type of population growth
Definition
Exponential Growth
Term
What is it called when a population's birthrate equals its death rate
Definition
Carrying capacity
Term
The maximum number of organisms of a particular species that can be supported by an environment is called
Definition
Carrying capacity
Term
What is a limiting factor of population growth
Definition
a factor that controls the growth of a population
Term
A limiting factor that depends on population size is called a
Definition
density dependent limiting factor
Term
List six density dependent limiting factors
Definition
competition, predation,herbivory, parasitism, disease, stress from overcrowding
Term
What are the two categories of Density - Independent Limiting Factors
Definition
Unusual Weather & Natural Disasters
Term
List three Unusual Weather situations that cause density independent limiting
Definition
Hurricanes, droughts, or floods
Term
Describe the general trend of human population growth over time
Definition
For tens of thousands of years, the human population grew very slowly. Then, about 500 years ago the population began to grow exponentially and then began to slow after the 1950's. It is still growing but more slowly than before.
Term
Who was Thomas Malthus and what did he predict
Definition
an English economist in the early 1800's who predicted that the limiting factors of human population were war (competition), limited resources (famine), and parasitism (disease).
Term
What is demography
Definition
scientific study of human populations
Term
What is demographic transition
Definition
when a human population transitions from high birthrates and high deathrates to low birthrates and low deathrates
Term
what is an age structure diagram
Definition
a graph that lists a population not by overall size but by age and sex. This allows a scientist to predict future population growth
Term
What is monoculture
Definition
an agricultural practice of clearing large areas of land to plant a single highly productive crop year after year
Term
What is a renewable resource
Definition
a resource that can be produced or replaced by a healthy ecosystem
Term
What are some examples of nonrenewable resources
Definition
fossiles fuels like coal, oil, and natural gas
Term
what is sustainable development
Definition
development of natural resources in a way that provide for human needs while preserving the ecosystem
Term
what is desertification
Definition
a process caused by nonsustainable farming, overgrazing, and seasonal drought which changes farmland to desert
Term
What is deforestation
Definition
the removal of forests
Term
What is a pollutant
Definition
a harmful material that can enter the biosphere
Term
What is biological magnification
Definition
When a pollutant accumulates in the tissues of a creature lower on the food chain which is then eaten by a consumer higher on the food chain resulting in higher levels of contamination at the upper levels of the food chain
Term
What is smog
Definition
a gray-brown haze formed by chemical reactions among pollutants released into the air by industrial processes and automobiles
Term
What is acid rain
Definition
When nitrogen and sulpher compounds released by factories and homes combines with water vapor to form nitric and sulfuric acids which are then carried by wind currents to other areas where they fall and erode living and nonliving things
Term
What is biodiversity
Definition
the total of all the genetically based variation in all organisms in the biosphere
Term
What is species diversity
Definition
the number of different species in the biosphere or in a particular area
Term
What are diatoms
Definition
Single celled organisms found in salt and fresh water
Term
What are the biological challenges that diatoms must face
Definition
Reproducing, maintaining homeostasis, obtain and use matter & energy,
Term
What are the 3 parts of cell theory
Definition
All living things are made up of cells, Cells are the basic units of structure and function in living things, and New cells are produced from existing cells
Term
What is a cell
Definition
Basic unit of all forms of life consisting of organelles enclosedby a permeable barrier
Term
What is a cell membrane
Definition
thin, flexible barrier that surrounds all cells
Organelle that regulates what enters and leaves the cell. It consists of a lipid bilayer (two layers of fats) with proteins that float in the lipid bilayer that are used as gates
Term
What is the cell nucleus
Definition
Organelle that contains the cell's genetic material in the form of DNA
Term
What type of lifeform consists of prokaryotic cells
Definition
Bacteria
Term
What is an eukaryote
Definition
Organisms whose cells contain a nucleus
Term
What is a prokaryote
Definition
Unicellular organism that lacks a nucleus
Term
What is fluorescence
Definition
The property of certain dyes to give off a specific light when exposed to a specific wavelength of light
Term
What is the objective lens
Definition
The lens that is located just above the specimen to be viewed
Term
Which microscope uses beams of electrons passing through a thin sample
Definition
Transmission Electron
Term
which microscope uses a beam of electrons to make an iomage of the specifmen's surface
Definition
Scanning Electron
Term
Cytoplasm
Definition
fluid portion of the cell outside the nucleus
Term
Organelle
Definition
specialized structure that performs important cellular functions within a eukaryotic cell
Term
Vacuole
Definition
cell organelle that stores materials such as water, salts, proteins, andcarbohydrates
Term
Lysosome
Definition
Cell organelle that uses enzymes to break down un-needed organelles, lipids, carbohydrates, and proteins into small molecules that can used by the rest of the cell
Term
Cytoskeleton
Definition
network of protein filaments in a eukaryotic cell that gives the cell its shape and internal organization and is involved in movement via cell flagella and cilia
Term
Microfilaments
Definition
threadlike structures made u p of a ptrotein called actin that forms extensive networks and produces a tough flexible framework that supports the cell and help it to move. They assemble or disassemble to extend or contract.
Term
Microtubules
Definition
Hollow structures made up of proteins known as tubulins and is important in maintaining cell shape and form the mitotic spindle which helps to separate chromosomes
Term
centriole
Definition
Every animal cell contains two of these microtubules. When the cell is dividing the centriole move to opposite ends of the cell and use mitotic spindles of threads to pull one of each of the pairs of chromosomes towards its end.
Term
Ribosome
Definition
the protein builders or the protein synthesizers of the cell. They are like construction guys who connect one amino acid at a time and build long chains
Term
Endoplasmic reticulum
Definition
internal membrane system found in eukaryotic cells; place where lipid components of the cell membrane are assembled
Term
Golgi apparatus
Definition
a stack of flattened membranes this organelle modifies, sorts, and packages proteins and other materials from the endoplasmic reticulum for storage in the cell or release outside the cell
Term
Chloroplast
Definition
The digestive system of plant cells. This organelle found in cells of plants and some other organisms that captures the energy from sunlight and converts it into chemical energy
Term
Mitochondrion
Definition
The digestive system of animal cells. This organelle takes in nutrients, breaks them down, and creates energy for the cell. The process of creating cell energy is known as cellular respiration. Cells that need more energy such as muscle cells will have more of these organelles than nerve cells which only transmit information.
Term
Cell wall
Definition
strong, supporting layer around the cell membrane in some cells
Term
Lipid bilayer
Definition
flexible double-layered sheet that makes up the cell membrane and forms a barrier between the cell and its surroundings
Term
Selectively permeable
Definition
propertyof biological membranes that allows some substances to pass across it while others cannot, also called semipermeable membrane
Term
How is protein created inside cells
Definition
Ribosomes assemble the protine using instructions from DNA
Proteins are extruded to surface of Endoplasmic reticulum where they are further modified by ribosomes on the ER
Newly assembled proteins are carried from the rough endoplasmic reticulum to the Golgi apparatus in vesicles
Term
Name 4 organelles that store, clean-up, and provide structural support
Definition
Vacuoles, lysosomes, cytoskeleton, and centrioles
Term
Name 3 organelles that are involved in building proteins
Definition
ribosomes, endopolasmic reticulum, and Golgi apparatus
Term
Fluid Mosaic Model
Definition
the organization of the phospholipids and proteins in a cell membrane
Term
Hydrophillic
Definition
Water loving (Latin)
Term
Hydrophobic
Definition
Water fearing (Latin)
Term
Diffusion
Definition
Process by which particles move from an area of high concentration to an area of lower concentration
Term
Facilitated diffusion
Definition
process by which molecules that cannot directly diffuse across the membrane pass through special protein channels
Term
Osmosis
Definition
the facilitated diffusion of water through a selectively permeable membrane
Term
Aquaporins
Definition
Water channel proteins that allow water to pass through cell membranes
Term
Isotonic
Definition
State where two adjacent solutions have the same concentration of solute (what is dissolved in them)
Term
Hypertonic
Definition
When two adjacent solutions do not have the same concentration of solute the solution that has a higher concentration of solute (what is dissolved in them)
Term
hypotonic
Definition
When two adjacent solutions do not have the same concentration of solute the solution that has a lower concentration of solute (what is dissolved in them)
Term
Osmotic Pressure
Definition
the force caused by the net movement of water by osmosis
Term
If a cell is in an isotonic solution then it will lose, gain, or retain the same amount of water in itself
Definition
The cell stays the same
Term
If a cell is in an hypertonic solution then it will lose, gain, or retain the same amount of water in itself
Definition
The cell loses water
Term
If a cell is in an hypotonic solution then it will lose, gain, or retain the same amount of water in itself
Definition
The cell gains water
Term
endocytosis
Definition
The taking of materials into a cell by means of infoldings of the cell membrane
Term
Phagocytosis
Definition
a type of endocytosis where an extension of cytoplasm surrounds a particle and packages it within a food vacuole
Term
Exocytosis
Definition
The release of large amounts of material from a cell
Term
tissue
Definition
a group of similar cells that perform a particular function
Term
Organ
Definition
a group of tissues working together to perform an essential task
Term
Organ System
Definition
a group of organs that work together to perform a specific taks
Term

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What is number 17

Definition

17

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What is Number 1

Definition

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Number 1 Mitochondria

Term

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What is Number 2

Definition

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What is Number

  2 Rough Endoplasmic Reticulum

Term

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What is Number 3

Definition

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What is Number

  3 Nucleus

Term

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What is Number 4

Definition

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What is Number

  4 Plasma Membrane

Term

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What is Number

5

Definition

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What is Number

  5 Nucleolus

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What is Number

6

Definition

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What is Number 6 Nuclear Envelope

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What is Number

7

Definition

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What is Number

7 Chromatin

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What is Number

8

Definition

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What is Number

8 Rough Endoplasmic Reticulum

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What is Number 9

Definition

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What is Number

9 Ribosomes

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What is Number

10

Definition

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What is Number

10 Smooth Endoplasmic Reticulum

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What is Number

11

Definition

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What is Number

11 Cillia

Term

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What is Number

12

Definition

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What is Number

12 Golgi Apparatus

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What is the brown string next to Number 13

 

Definition

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What is Number

13 Microtubules

Term

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What is Number

14

Definition

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What is Number

14 Centrioles

Term

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What is Number

15

Definition

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What is Number

15 Peroxisome

Term

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What is Number

16

Definition

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What is Number

16 Lysosome

Term

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What is Number

17

Definition

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What is Number

17 Microfilaments

Term

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What are the holes in the Nucleus called?

Definition

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The holes in the nucleus are called Nuclear pores and allow messenger DNA to leave the Nucleolus

Term
How does the body maintain homeostasis and eliminate sudden spikes in PH levels
Definition
How does the body maintain homeostasis and eliminate sudden spikes in PH levels.

A change in blood PH is countered by chemical buffers such as bicarbonate and phosphate ions (2.2)
Term
What is a base
Definition
What is a base.

What is a base.

A compound with a PH above 7 that produces hydroxide (OH-) ions in solution.

Lye (NaOH) which was used to make soap in the old days has a pH value above 10. (2.2)
Term
What is an acid
Definition
What is an acid.

Any compound that forms H+ ions in solution.

Hydrochloric Acid (stomach acid) HCI is a strong acid with a pH rating below 4. (2.2)
Term
What is the solvent in a solution
Definition
What is the solvent in a solution.

The substance in which the solute dissolves (2.2)
Term
What is the solute in a solution
Definition
What is the solute in a solution.

The substance that is being dissolved (2.2)
Term
Why is water such a good solvent
Definition
Why is water such a good solvent.

Water is a good solvent It is able to form bonds with positive and negative ions for other atoms which allows it to evenly distribute the solute throughout the water (solvent)

When an ionic or polar compound enters water, it is surrounded by water molecules. The relatively small size of water molecules typically allows many water molecules to surround one molecule of solute. (2.2)
Term
What is a suspension
Definition
What is a suspension.

A suspension is a mixture of water and nondissolved materials in which fine particles are suspended in a fluid where they are supported by buoyancy.

Eventually the particles will settle out and fall to the bottom.

Milk, blood, and paint are examples. (2.2)
Term
What is a compound
Definition
What is a compound.

A chemical compound is a substance formed by the chemical combination of two or more elements in a definite proportion.

They are identified by their chemical formula.
H2O (water) is two hydrogen elements and one oxygen element.

Compounds are often very different than the elements of which they are made (2.1)
Term
Compare the structure of carbon 12 and carbon 14
Definition
Compare the structure of carbon 12 and carbon 14.

Carbon 12 and carbon 14 have six protons and six electrons. However, carbon 12 has six neutrons, whereas carbon 14 has eight neutrons. (2.1)
Term
Changing the number of neutrons of an atom changes it into an ____________
Definition
Changing the number of neutrons of an atom changes it into an ____________.

Isotope (2.1)
Term
What are some uses of radioactive isotopes
Definition
What are some uses of radioactive isotopes.

Determine the ages of rocks and fossils, radiation can be used to kill cancer cells, kill bacteria, used as tracers when attached to other medicines when injected into the body. (2.1)
Term
What are two main types of bonds that hold the atoms within a compound together
Definition
What are two main types of bonds that hold the atoms within a compound together.

Ionic bonds & covalent bonds (2.1)
Term
Water (H2O) and hydrogen peroxide (H2O2) both consists of hydrogen and oxygen atoms. Explain why they have different chemical and physical properties.
Definition
Water (H2O) and hydrogen peroxide (H2O2) both consists of hydrogen and oxygen atoms. Explain why they have different chemical and physical properties..

The two compounds have different properties because they contain hydrogen and oxygen in different proportions (2.1)
Term
Why do all isotopes of an element have the same chemical properties
Definition
Why do all isotopes of an element have the same chemical properties.

All isotopes of an element have the same number of protons and electrons but have different number of neutrons. (2.1)
Term
What are isotopes
Definition
What are isotopes.

All isotopes of an element have the same number of protons and electrons but have different number of neutrons. (2.1)
Term
If an atom of calcium contains 20 protons. How many electrons does it have
Definition
If an atom of calcium contains 20 protons. How many electrons does it have.

20 Electrons. (2.1)
Term
What are neutrons
Definition
What are neutrons.

Component of an atom consisting of 2 down Quark & 1 Up Quarks with a net charge of zero

2 x down quark (-1/3 + -1/3 charge)
1 x up quarks (2/3 charge)
(-1/3) + (-1/3) + (2/3) = zero charge

Since up down quarks are more massive than up quarks the neutron is slightly more massive than protons.

The number of neutrons in a nucleus determines the isotope of an element.
Neutrons are only stable when bound in a nucleus with protons.
Free neutrons are unstable and are produced in nuclear fission and nuclear fusion. (2.1)
Term
What are protons
Definition
What are protons.

What are protons.

Component of an atom consisting of 1 down Quark & 2 Up Quarks with a net charge of +1

1 x down quark (-1/3 charge)
2 x up quarks (2/3 charge + 2/3 charge)
(-1/3) + (2/3) + (2/3) = +1 charge

A single proton by itself is called an Hydrogen Ion H+.

The number of protons in a nucleus determines the atomic number of an element. (2.1)
Term
What are electrons
Definition
What are electrons.

An elementary particle (Lepton) with a charge of -1

The electron is a negatively charged elementary particle that surrounds the nucleus of an atom.

Because of its negative electrical charge, the electron is attracted to the positively charged protons within the atom's nucleus, keeping them bound to the nucleus.

The electron's negative charge also keeps atoms from passing through one another—the repulsion caused by the like charges keeps the atoms apart. (2.1)
Term
List the three subatomic particles in an atom and describe how they affect the properties of an element
Definition
List the three subatomic particles in an atom and describe how they affect the properties of an element.

Protons : Determine the type of element

Electrons : Determine the reactivity of the element

Neutrons : Determine the radioactivity of the element (2.1)
Term
Describe the structure of an atom.
Definition
Describe the structure of an atom..

An atom is an extremely small unit of matter with a nucleus in the center. The nucleus is formed of subatomic particles called protons, which are positively charged, and neutrons, whch have no charge. Smaller subatomic particles called electrons, which are negatively charged, are in constant motion in the space surrounding the nucleus. (2.1)
Term
What is an element
Definition
What is an element.

A chemical element is a pure substance that consists entirely of one type of atom. More than 100 elements are known. About two dozen are commonly found in living organisms. (2.1)
Term
What is a solution
Definition
What is a solution.

A solution is a mixture in which one substance is dissolved in another.

The molecules of the solute (what is being dissolved) are evenly distributed throughout the solvent (what is being mixed into)
in a process called dissolution.

The solute will not separate from the solvent once they have mixed unless they are acted upon by another force.

sugar (solute) in water (solvent) is an example. They do not form a new kind of molecule but exist homogenously throughout the solution. (2.2)
Term
What is a chemical mixture
Definition
What is a chemical mixture.

A material composed of two or more elements or compounds that are physically mixed together but not chemically combined (2.2)
Term
What is a protein
Definition
What is a protein.

What is a protein.

macromolecules mde up of carbon, hydrogen, oxygen, and Nitrogen.

These polymers are assembled from individual monmers called amino acids.

Primary Structure: DNA controls the order of the amino acids in a protein chain.

Secondary Structure: the protein chain bends and folds based on positive and negative charges

Proteins control the rate of reactions and regulate cell processes (2.3)
Term
What are nucleic acids
Definition
What are nucleic acids.

What are nucleic acids.

macromolecules containing hydrogen, oxygen, nigrogen, carbon, and phosphorus.

These polymers are assembled from individual monmers known as nucleotides

( 5 carbon sugar, a phosphate group and a nitrogenous base).

Nucleic acids are involved with the storage and transmission of hereditary information. (2.3)
Term
What are lipids
Definition
What are lipids.

molecules made up of carbon and hydrogen that are bonded to a glycerol molecule that are used in the cell walls.

Lipids store energy in fats, oils, and waxes (2.3)
Term
What are amino acids
Definition
What are amino acids.

compounds with an amino group on one end and a carboxyl group on the other that are used to create proteins. (2.3)
Term
What are carbohydrates
Definition
What are carbohydrates.

compounds made up of carbon, hydrogen, and oxygen atoms in the ratio 1:2:1

Living things use carbohydrates as their main source of energy. (2.3)
Term
Why are proteins considered polymers but lipids are not
Definition
Why are proteins considered polymers but lipids are not.

Proteins are considered polymers because they are made of chains of amino acids. Lipids arenot considered polymers because they are not made of chains of smaller units; they are made of a glycerol molecule combined with fatty acids. (2.3)
Term
Name four groups of organic compounds (macromolecules) found in living things
Definition
Name four groups of organic compounds (macromolecules) found in living things.

Carbohydrates, lipids, nucleic acids, proteins (2.3)
Term
What properties of carbon explain carbon's ability to form different large and complex structures
Definition
What properties of carbon explain carbon's ability to form different large and complex structures.

Carbon atoms can bond to the atoms of many other elements.

Carbon atoms can also readily bond to one another to form chains and rings.

It can form single, double, or triple covalent bonds. (2.3)
Term
What are the major elements of life
Definition
What are the major elements of life.

Carbon, hydrogen, oxygen, phosphorus, sulfur, and nitrogen (2.3)
Term
What is surface tension
Definition
What is surface tension.

A water molecule can form up to 4 hydrogen bonds with other water molecules. On the surface of the water they have no water bonds above them and therefore form tighter bonds with the molecules beside them which forms a film on the surface (2.2)
Term
What is adhesion
Definition
What is adhesion.

When the attractive forces are between unlike molecules, they are said to be adhesive forces.

The adhesive forces between water molecules and the walls of a glass tube are stronger than the cohesive forces lead to an upward turning meniscus at the walls of the vessel and contribute to capillary action. (2.2)
Term
What is cohesion
Definition
What is cohesion.

the attraction between molecules of the same substance.

It is the cause of drops of water forming beads on a smooth surface instead of spreading out evenly. (2.2)
Term
What are four of the properties of water that are due to the hydrogen bonds that it forms
Definition
What are four of the properties of water that are due to the hydrogen bonds that it forms.

Cohesion - attraction between molecules of the same substance

Adhesion - attraction between molecules of substances which are different

Heat Capacity - water can absorb a lot of energy without the temperature rising

High Boiling Point - Water remains in the liquid state up to 212 degrees fahrenheit (100 deg. celcius) instead of boiling away as a gas

Less dense as a solid than as a liquid so that ice floats

Surface tension - the hydrogen bonds form a surface on the water that can support light creatures (2.2)
Term
If a solution has a PH of 4 it is said to be ____________
Definition
If a solution has a PH of 4 it is said to be ____________.

An acid is any solution with a PH below 7 and it has more hydrogen ions H+ (2.2)
Term
If a solution has a PH of 12 it is said to be __________
Definition
If a solution has a PH of 12 it is said to be __________.

A base is any solution with a PH above 7 and it has more hydroxide OH- ions (2.2)
Term
A potassium atom easily loses its one valence electron. What is the characteristic of the element that determines how hard it holds onto its electrons
Definition
A potassium atom easily loses its one valence electron. What is the characteristic of the element that determines how hard it holds onto its electrons.

Electronegativity determines how hard an atom holds onto its valence electrons. Elements with high electronegativity will hold onto their electrons tighter and be more likely to steal electrons from other elements. (2.1)
Term
A potassium atom easily loses its one valence electron. What type of bond will it form with a chlorine atom
Definition
A potassium atom easily loses its one valence electron. What type of bond will it form with a chlorine atom.

Ionic (2.1)
Term
What is a Covalent Bond
Definition
What is a Covalent Bond.

bond that is formed when two elements are bonded together because they share an electron.

When two or more elements are bonded together with a covalent bond they are called a molecule. (2.1)
Term
What is an ionic bond
Definition
What is an ionic bond.

bond that is formed when two elements are bonded together because one element gives up an electron to another element.

That causes one element to be positive (because it is now not balanced because it is missing an electron) and the other is negative (because it now has an extra electron) and then each element is attracted to the other and they stick together. (2.1)
Term
Why does the structure of a water molecule cause it to be polar
Definition
Why does the structure of a water molecule cause it to be polar.

The electronegativity of the oxygen atom is stronger than the electronegativity of the hydrogen atom. Therefore, the oxygen end of the molecule contains the shared electron more often than the hydrogen end of the molecule (2.2)
Term
Why do hydrogen bonds form between water molecules
Definition
Why do hydrogen bonds form between water molecules.

A hydrogen bond occurs when the slight positive charge on a hydrogen atom in one water molecule is attracted to the slight negative charge on the oxygen atom in another water molecule (2.2)
Term
What does it mena when a molecule is said to be "polar"
Definition
What does it mena when a molecule is said to be "polar".

A molecule is polar when there is an uneven distribution of electrons between its atoms. This causes the molecule to have an area with a slight negative charge and an area with a slight positive charge. (2.2)
Term
What three factors influence the electronegativity of an element
Definition
What three factors influence the electronegativity of an element.

The distance of the valence electrons from the nucleus, the number of protons in the nucleus, and the number of "s" shells in the atom which shield the valence electrons from the influence of the protons in the nucleus. (2.1)
Term
What is a chemical reactant
Definition
What is a chemical reactant.

The elements or compounds that enter into a chemical reaction to produce a new thing which is called the product. (2.4)
Term
How do enzymes work
Definition
How do enzymes work.

Enzymes provide a site where reactants, called substrates, can be brought together to react

The substrates bind to a site on the enzyme called the active site, forming an enzyme-substrate complex.

This reduces the activiation energy needed for the reaction. (2.4)
Term
What is a an enzyme
Definition
What is a an enzyme.

Enzymes are proteins in the body that act as catalysts. They speed up chemical reactions that take place in cells.

Without the enzyme carbonic anhydrase your body would not be able to convert carbon dioxide from your cells into carbonic acid (which can be transported by red blood cells) fast enough to keep you from dying from an overdose of carbon dioxide. After the red blood cell reaches the lungs, it turns the carbonic acid back into carbon dioxide so it can leave the body through the lungs and in the process it creates more of the enzyme needed to repeat the process. (2.4)
Term
What is a catalyst
Definition
What is a catalyst.

a substance that speeds up the rate of a chemical reaction or lowers the amount of activation energy needed to start the chemical reaction.

Enzymes are proteins in the body that act as catalysts. They speed up chemical reactions that take place in cells. (2.4)
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Brain

There are 5 primary divisions of the brain?  What is the most anterior section of the brain?

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#1 : The telencephalon (also known as the cerebrum) is part of the forebrain.  It is the most anterior section of the brain and in humans it is also the most superior section.

 

The cerebrum is composed of the following sub-regions:

  • Cerebral cortex, or cortices of the cerebral hemispheres
  • Basal ganglia, or basal nuclei
  • Limbic System

This section is the newest evolutionary brain development.

 

Controls:

Voluntary Movement

Sensory Processing

Olfaction (in humans)

Language and Communication

Learning and Memory

 

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Brain

There are 5 primary divisions of the brain?  What is the most posterior division of the brain?

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#5 : The most posterior division of the brain before it becomes the spinal cord is the Myelencephalon

  • It part of the hindbrain. 
  • Commonly known as the Medulla Oblongata. 
  • This is where the nerves decussate or swap sides so that the right side of the brain controls the left side of the body and vice versa.
  • Controls muscle tone, pulse, blood pressure, respiration.
  • Autonomic Functions
  • Breathing
  • Conduction Pathway for Nerve Tracts
  • Digestion
  • Heart Rate
  • Swallowing
  • Sneezing

( http://biology.about.com/library/organs/brain/blmyelenceph.htm )

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Brain

There are 5 primary divisions of the brain?  What is the division that contains the cerebellum?

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#4 :  Metencephalon

 

Contains:  Cerebellum & Pons

 

Controls: 

  • Breathing
  • Coordinate muscle movements
  • Maintains posture
  • integrates sensory information from the inner ear and proprioceptors in the muscles and joints
  • Sleep & Arousal

 

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Brain

There are 5 primary divisions of the brain?  Which division is known as the Mid-brain?

Definition

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#3 :  Mesencephalon

 

The Mesencephalon (mid-brain) is located between the forebrain and the hindbrain.

 

Contains:

Tectum (roof)

Tegmentum

 

Function:

  • Controlling Responses to Sight
  • Eye Movement
  • Pupil Dilation
  • Body Movement
  • Hearing

 

( http://biology.about.com/library/organs/brain/bldienceph.htm )

 

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Brain

There are 5 primary divisions of the brain?  What is the most posterior division of the brain?

Definition

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#2 :  Diencephalon

 

Contains the Thalamus & the Hypothalamus

 

It is part of the forebrain.

 

Function:

  • Chewing
  • Directs Sense Impulses Throughout the Body
  • Equilibrium
  • Eye Movement, Vision
  • Facial Sensation
  • Hearing
  • Phonation
  • Respiration
  • Salivation, Swallowing
  • Smell, Taste

( http://biology.about.com/library/organs/brain/bldienceph.htm )

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