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MEMBRANES, long hydrocarbon chains - part of fatty acids, fluid mosaic…
MEMBRANES
FUNTION
separation
distinction between cells
protection
protect organelles from outside
regulation
selective permeability
communication
can "speak" because there's holes in the membrane but some just throw stuff at each other
COMPOSITION
lipids
phospholipids
hydrophilic "head"
connected by three carbons
hydrophobic "tail"
neutral
amphipathic
cholesterol
the hydroxyl group in the cholesterol forms a polar covalent bond
the hydroxyl group of the cholesterol is facing the heads because they're both hydrophilic
the steroid part lines up with the tails because they're all hydrophobic
polypeptides
Integral
channel protein
embedded within the membrane
functions as a doorway
proteins can move around within the membrane of the cell
trans membrane protein
polysacchararides
glycoprotein
long hydrocarbon chains - part of fatty acids
sometimes they can form a "kink" at a double bond which makes more space between the lipid tails and allows it to have some movement/fluidity
fluid mosaic model
"porous"
"carbohydrates"
"proteins"
"steroid"
created with a phosphate group attached to a
choline
molecule and
inositol
"apolar" head
LOVES water
HATES water