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Biology Test 32
Official
84
Biology
12th Grade
10/12/2011

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Term
Atomic Number 
Definition
Number of Protons (on top)
Term
Mass Number
Definition
Number of protons plus neutrons (on bottom)
Term
Isotope
Definition
Same number of protons and electrons, but different number of neutrons
Term
Ionic Bond
Definition
An attraction between oppositely charged Ions
Term
Covalent Bond
Definition
Forms when atoms share one ore more pairs of outer electrons
Term
Polar Molecule
Definition
has opposite charges on opposite ends
Term
Cohesion
Definition
tendency of molecules of the same kind to stick together
Term
Acid
Definition
Adds H+ to a solution
Term
Base
Definition
Takes H+ from a solution
Term
pH scale
Definition
measure of the hydrogen ion H+ concentration in a solution
Term
Macromolecules
Definition
Made up of polymers
Term
Polymers
Definition
large molecules made by stringing together many smaller molecules called monomers
Term
Hydrolysis
Definition
Means to break with water
Term
Carbohydrates
Definition
Sugar polymers. Such as monosaccharides, dissaccharides
Term
Monosaccharides
Definition
Simple sugars cannot be broken by hydrolysis. Main fuel molecules for cell work, like other sugars.
Term
Dissaccharides
Definition
double sugar constructed of two monosaccharides through a dehydration reaction. Sugar.
Term
Polysaccharides
Definition
long chains of sugar units. Polymers of monosaccharides. Starch. 
Term
Lipids
Definition
organic compounds that are hydrophobic. includes fats
Term
fats/triglyceride
Definition
stores energy
Term
unsaturated
Definition
fewer than the maximum hydrogens at bonding point
Term
saturated
Definition
contain maximum number of hydrogen atoms. Solid at room temperature.
Term
Hydrogenation
Definition
converting unsaturated fats to saturated fats in order to make some things solid at room temp
Term
Steroids
Definition
Such as cholesterol. Cholesterol is the "base steroid" from which your body makes other steroids
Term
Protein
Definition
a polymer constructed from amino acid monomers
Term
Amino acid
Definition
consists of central carbon atom bonded to four covalent bonds.
Term
Peptide bond
Definition
the bond between adjacent amino acids
Term
polypeptide
Definition

The resulting long chain after peptide bond

Term
Denaturation
Definition
some unfavorable quality of the environment that causes protein to change shape 
Term
Nucleic Acids
Definition
DNA/RNA
Term
Gene
Definition
Specific DNA stretch that programs the amino acid sequence of a polypeptide
Term
Nucleotides
Definition
Monomers found on the nucleic acid polymer
Term
DNA
Definition
Adenine A, Thymine T, Guanine G cyosine C
Term
RNA
Definition
AGC and U(uracil)
Term
Plasma Membrane
Definition
thin outer membrane which regulates traffic of molecules between the cell and it's surroundings
Term
cytoplasm
Definition
region between nucleus and plasma membrane is cytoplasm
Term
Phospholipids
Definition
Dietary fats with two fatty acid tails. In plasma membrane
Term
Extracellular matrix
Definition
layer holds cells together in tissues, and it can also have protective and supportive functions.
Term
Nuclear Envelope
Definition
Nucleus boarded by double membrane which has pores to allow certain materials pass in and out
Term
Nucleolus
Definition
a prominent structure within the nucleus where ribosomes are made
Term
Ribosomes
Definition
responsible for protein synthesis
Term
Chromatin
Definition
DNA and proteins
Term
chromosome
Definition
a wrapped fiber of chromatin
Term
Endomembrane system
Definition
includes nuclear envelope, endoplasmic reticulum, the golgi apparatus, lysomones, and vacuoles
Term
ER
Definition
produces enormous variety of molecules
Term
Rough ER
Definition
produce membrane proteins and secretory proteins. Has ribosomes
Term
Smooth ER
Definition
lacks ribosomes. Synthesis of lipids
Term
Golgi Apparatus
Definition
Receives, Refines, stores, and distributes chemical products of the cell. "The Warehouse"
Term
Lysomone
Definition
waste control
Term
Vacuoles
Definition
sacs that bud from the ER, Golgi, or plasma membrane
Term
Chloroplasts
Definition
Perform photosynthesis
Term
Stroma
Definition
thick fluid within the chloroplast
Term
Grana
Definition
trap light energy and convert into chemical energy. Stacks of Stroma
Term
Matrix
Definition
the thick liquid found in mitochondria
Term
Cristae
Definition
The infoldings of the inner membrane found in mitochondria.
Term
Cytoskeleton
Definition
muscle and skeleton of cell
Term
microtubules
Definition
straight hollow tubes made of proteins.
Term
ATP
Definition
consists of organic model called Adenosine plus a tail of three phosphate groups. Phosphate does work. It is ADP when one phosphate leaves. It gains P back through cellular respiration.
Term
Enzyme
Definition
protein that speeds up chemical reactions
Term
Metabolism
Definition
total number of chemical reactions in an organism
Term
Substrate
Definition
The reactant molecule recognized by the enzyme
Term
active site
Definition
region on enzyme that has the shape to fit the substrate molecule
Term
induced fit
Definition
change of enzyme shape due to subtstrate.
Term
Passive transport
Definition
diffusion across a membrane. Big to small. No energy.
Term
Facilitated diffusion
Definition
where specific proteins that act as selective corridors.
Term
Osmosis
Definition
diffusion of water across membrane
Term
plasmolysis
Definition
plant cell loses water, it shrivels, plasma membrane pulls away from cell wall
Term
Receptor-mediated endocytosis
Definition
specific. Triggered by binding of certain external molecules to specific protein receptors.
Term
Phagocytosis
Definition
use of food vacuoles
Term
Pinocytosis
Definition
Water vacuoles
Term
Signal Transduction Pathway
Definition
Reception, Transduction, Response
Term
Oxidation
Definition
Loss of electrons during a redox reaction
Term
Reduction
Definition
acceptance of electrons during a redox reaction
Term
Redox Reactions
Definition

Chemical reactions that transfer electrons to substances

Term
Chloroplasts
Definition
light absorbing organelles
Term
Chlorophyll
Definition
light absorbing pigment in the chloroplasts that plays a central role in converting solar energy to chemical energy
Term
Stomata
Definition
Pores that take in CO2 and spit out O2
Term
Stroma
Definition
thick liquid in the inner membrane of chloroplast
Term
thylakoids
Definition
interconnected membranous sacs in chloroplast
Term
Grana
Definition
stacks of thylakoid.
Term
Light Reactions
Definition
chlorophyll absorbs solar energy and converts solar energy to ATP and NADPH
Term
Calvin Cycle
Definition
uses light reactions to power the production of sugar from carbon dioxide
Term
Respiratory Cell Process
Definition

Glycolosys

Pyravate oxidation-C02

Citric acid cycle

Ox. phosphorylation-O2 used

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