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30 Cards in this Set

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  • Back
cell membrane
"fluid mosaic model"
cell membrane made of...
phospholipid bilayers
selectively permeable
decides what goes in/out
non-polar molecules
pass through easily
ie oil
non-polar molecules=
no charge & doesnot dissolve in water
peripheral proteins
proteins located outside of cell membrane
integral proteins
proteins remain inside:
channel-pore proteins
carrier proteins
recognition proteins
receptor proteins
recognition proteins
act as identification & defense mechanism-destroys molecules that it doesnt recognize
diffusion & osmosis:
concentration-1% or 10%
gradient
osmosis
osmosis:
the movement of a water molecule from an area of high concentration to an area of low concentration across a semi-permeable membrane
osmotic pressure
water moving up because of osmosis
solute
what is dissolved in water
ie sugar
solvent
the solution created from the solute
hypotonic solution contains...
less concentration of solute (water enters)
hypertonic solution
has higher concentration of solute (water leaves)
isotonic solution
has even concentration
(water doesnt move)
cell lysis
cell breaks
turgor pressure
water goes in & causes stuff to swell
plasmolysis
when plant cells are placed in hypertonic solution & cell shrinks
passive transport
everything moves from high to low
active transport
moves from low to high
cyrosis
how large molecules are transported
exocytosis
out
indocylosis
in
cell cycle:
interphase
period of growth but not dividing (90%)
cell cycle:
cell division
a. nuclear division (mitosis)-nucleus divides
b. cytoplasmic division (cytokinesis)-rest of cell divids
c. dna replication
chromosomes
(46) in form of DNA & protein (chromatin)
-number must remain constant in the nucleus
homologous chromosome
pairs where both are the same (23 pairs of chromosomes)
sex cells have...
(sperm & egg) have half the number of chromosomes and come together to make baby
interphase
DNA replicates