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Science Flashcards 4 finals
Finals! Blahh lets see how i do
62
Science
7th Grade
12/13/2009

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Term
Nucleus
Definition
The brain of the cell that stores dna and tells everyone what to do
Term
Nuclear Membrane
Definition
the outside semi-permible layer of nucleous
Term
Chromatin
Definition
the strands of dna that holds the instructions for the cells daily functions
Term
Nucleolus
Definition
Inside nucleus makes ribosomes
Term
Mitochondria
Definition
Makes atp and is the powerhouse of the cell
Term
Endoplasmic reticulum
Definition
the passageway for the cells
Term
Ribosomes
Definition
Make proteins
Term
Golgi Body
Definition
Packages and transports proteins and other newly made materials
Term
Chloroplast
Definition
Make energy through sunlight
Term
Vacuole
Definition
Stores food
Term
Lysosome
Definition
Suicide sac, has digestive enzymes that digest old materials
Term
How are bacterial cells different from eukaryotic cell
Definition
Bacterial cells are 10x smaller than eukaryotic
Term
What are specialized cells
Definition
cells in bone brain blood,etc
Term
Which organelles are specific to plant and animals cells
Definition
Cyloplast= Plants Lysosomes= Animal
Term
Element vs. Compound
Definition
Element=simplest form Compound= Two elements
Term
Atom vs. Molecule
Definition
Molecules are in elements and atoms are in everything
Term
Organic vs. Inorganic
Definition
Organic= carbon Inorganic= no carbon
Term
What are the four types of organic
Definition
Carbohydrates, proteins, lipids, and nucleic acids
Term
What is a carbohydrate
Definition
An energy rich organic compound sugars and starches
Term
What is a protein
Definition
Large organic molecules meat and eggs
Term
What are proteins made of
Definition
amino acids, carbon, hydor]]rogen, oxygen, and nitrogen
Term
what does an enzymes do? What is it made of?
Definition
A protein that speeds op chemical reactions
Term
What lipids
Definition
Fat ex. Butter or cheese, etc
Term
What is a nucleic acid
Definition
A large organic molecule
Term
Two types of nucleic acids
Definition
DNA, RNA
Term
How is water important for living things?
Definition
Chemical reactions wouldn't take place they would loose their shape and make tempertures change rapidally
Term
Why is the cell membrane compared to a gatekeeper
Definition
Because it is semi-permeable
Term
what does selectivly permeable mean
Definition
Only lets a couple materials in and out
Term
What substances is a cell membrane permable to
Definition
Water, oxygen, and Co2
Term
What is diffusion, What causes it, How does diffusion work in cells
Definition
Diffusion is when molecules go up and down the concentration gradient
Term
what is osmosis
Definition
diffusion in water
Term
What is active transport and how does it differ from passive
Definition
Active transport moves with energy while passive doesn't use energy
Term
What are transport proteins
Definition
Proteins that use no energy to work
Term
What is transport my engulfing
Definition
Ameobas engulf small proteins n=by smneaking up to them and ingulfing them then the amoebas get energy to move
Term
Why are cells small
Definition
While they travel through cytoplasm it would take too long to get to the destination
Term
What is photosynthesis
Definition
To put light together... uses light/energy from the sun and CO2 to make food for flower(glucose) and oxygen
Term
What are the products of photosynthesis
Definition
Oxygen and glucose
Term
why is photosynthesis good for heterotrophs
Definition
Because heterotrophs need to feed on something to live
Term
What substance captures energy from the sun during photosynthesis
Definition
leaves/ green parts
Term
What do photosynthesis and respiration do for the atomsphere
Definition
Photosynthesis= gives oxygen which we need to "feed" ATP which respiration makes
Term
What are the products of respiration
Definition
Minus two ATP plus four with a net of 2 ATP
Term
What is the difference between respiration and fermentation
Definition
Respiration goes through the kreb cycle and makes atp, while fermentation just has glucose
Term
In respiration, the main energy releasing stage takes place in which organelle
Definition
Mitochendria
Term
What causes fermentation
Definition
Not enough oxygen to feed ATP
Term
What is alcoholic fermentation
Definition
Fermentation that occurs in carbonation in alcohol and soda
Term
What is chromatid
Definition
A organelle that stores DNA
Term
Which nitrogen bases pair with each other
Definition
a/t c/g
Term
What are the three stages of the cell cycle
Definition
Interphase, Metaphase, Cytokinesis
Term
What happens during interphase
Definition
DNA replication, Growth, Preparation for departure
Term
What happens during mitosis
Definition
Nucleus diveds into two nuclei
Term
What happens during interphase
Definition
DNA replication, Growth, Preparation for departure
Term
What happens during mitosis
Definition
Nucleus diveds into two nuclei
Term
What happens during cytokinesis
Definition
Departs (does last check up before)
Term
What gets copied when cells replicate
Definition
dna
Term
What is cancer
Definition
A large collection of abnormal cells grow and divide uncontralably
Term
How does cancer grow
Definition
It travels through the blood stream and grows somewhere else
Term
How does cancer grow
Definition
It travels through the blood stream and grows somewhere else
Term
How does cancer spread through the body
Definition
The cancer enters the bloodstream and plants itself somewhere else in the body
Term
what is tumor
Definition
A tumor is a collection of cancerous cells clumped together
Term
How is cancer treated
Definition
Chemotherpy or drugs and radation
Term
What are the main causes the cancer
Definition
Smoking and bad diets
Term
How does a cancer begin
Definition
Dna Replication messes up and the cell goes out of control and grow and divides uncontralably
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