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MCAT: BIO 1
The Cell
46
Biology
Graduate
08/26/2009

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Term
Cell Theory
Definition
1) All living things are made of cells
2) Cells are the basic unit of life
3)Cells come from cells
4) Cells pass genetic info
Term
3 Ways to study cells
Definition
1)Microsopy
2)Centrofugation
3)Autoradiography
Term
Resolution
Definition
Differentiation of two close objects
Term
How to determine the magnification of a microscope
Definition
eyepeice mag X objective lens mag
Term
Microscope diaphragm
Definition
controls the amount of light that passes through the slide
Term
3 types of microscopes and their use
Definition
compound: dead things
electron: live cells
phase: super close and dead
Term
how does autoradiography work
Definition
a radioactive material tags the object. incubate it to allow for radioactive decay. see a silver grainy image.
Term
what is autoradiography really good for?
Definition
seeing amino acids and protien synthesis.
Term
jelly inside a cell
Definition
cytosol
Term
two main types of prokaryotes
Definition
cyanobacteria and bacteria
Term
compare prokaryotic and eukaryotic ribosomes
Definition
pro:30 and 50 S subunits
euk: 40 and 60 S subunits
Term
what is the outide of prokaryotic cells like?
Definition
cell wall...ALL OF THEM have this
Term
what is the cytoskeleton composed of
Definition
microtubules, microfilaments, and intermediate fibers.
Term
what makes the hydrophobic part of the cell membrane hyrdophobic?
Definition
cholesterol
Term
CAM's
Definition
cellular adhesion molecules. Help cells stick together
Term
receptors
Definition
complex glycoproteins that recieve outside things
Term
what is the cell mem. status of permeability for the following things: Oxygen, small charged particles, H20
Definition
O: anytime
small charged particles: need a protein
H20: anytime
Term
proteins that hold DNA
Definition
histones
Term
what happens in the nucleolus?
Definition
rRNA synthesis
Term
special skills of smooth and rought ER
Definition
Smooth: makes lipids and detoxes cell
Rough: protein synthesis
Term
ribosomes make?
Definition
proteins
Term
lysosomes
Definition
organelles that eat things.
Term
how to lysosomes work?
Definition
they have enzymes that digest certain cellular junk
Term
autolysis
Definition
cellular suicide. cell ruptures it's lysosomes and the inside enzymes eat the cell from within.
Term
microbodies
Definition
membrane bound organelles for metabolic activities
Term
what are the most common microbodies and what do they do?
Definition
1.peroxisomes:oxidate to make peroxide
2.glyoxisomes:detox to break fat.
fat->sugar in plant seedlings
3.lysosomes
Term
where would you find circular DNA?
Definition
mitochondria
Term
how to mitochondria replicate?
Definition
binary fission
Term
main molecule of the cell well
Definition
cellulose
Term
microtubules: composition and use
Definition
made of tubulin
make centrioles, flagella and cilia
Term
microfilaments: composition and use
Definition
actin and mysosin
contraction, movement, expansion
Term
ways to do movement across a membrane
Definition
1. diffusion
2. fascilitated diffusion
3. active transport
4. endocytosis
5. exocytosis
Term
simple diffusion
Definition
movement down a concentration gradient
Term
osmosis
Definition
simple diffusion of water
Term
isotonic
Definition
when solute concentration is the same inside and outside a cell
Term
fascilitated diffusion
Definition
movement down a conc. gradient with the help of proteins. NO ENERGY NEEDED.
Term
active transport
Definition
movment against a concentration gradient with the use of proteins and some form of energy.
Term
what is active trasport used for mostly?
Definition
creating a potential
Term
endocytosis and exocytosis
Definition
endo:taking materials into the cell
exo:releasing materials from the cell
Term
BASIC TISSUE TYPES
Definition
1. epithelial
2. connective
3. nervous
4. muscle
Term
epitheleal tissue location and use
Definition
covers surface and lines cavities
protection, absorption, secretion, sensation
Term
connective tissue location and use
Definition
bone, blood, cartilage, tendons, ligaments, adipose tissue

body support and functions
Term
nervous tissue location and use
Definition
neurons
sensation
Term
muscle tissue types and main skill of muscle tissue
Definition
types:cardiac, skeletal, smooth
has great contractile capability
Term
composition of a virus
Definition
nucleic acid and protein coat called capsid
Term
What is the name of parasites that can express genes and reproduce only within a host cell?
Definition
obligate intracellular parasites
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