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Cell Bio Ch11

Ch11

TermDefinition
Plasma Membrane membrane that surrounds a living cell -selectively permeable -enlarges and can change shape -reseals upon puncture
Internal Membrane enclose intracellular compartments -subtle differences, especially in its resident proteins, gives each organelle its distinctive character
All cell membranes are composed of ? lipids and proteins, and share a common general structure -lipid bilayer -proteins carry out other functions and gives different membranes their individual characteristics
Lipid Bilayer lipids are arranged in two closely apposed sheets -gives the membrane its basic structure and serves as a permeability barrier to most water-soluble molecules *universal basis of membrane structure
Each lipid has? a hydrophilic (water-loving) head 1 or 2 hydrophobic (water-fearing) hydrocarbon tails
Phospholipids most abundant lipids in cell membranes hydrophilic head is linked to the rest of the lipid thru a phosphate group
Phosphatidylcholine most common phospholipid in most cell membranes has a choline molecule attached to a phosphate which is attached to glycerol as its hydrophilic head and 2 long hydrocarbon chains as its hydrophobic tails
Amphipathic molecules with both hydrophilic and hydrophobic properties
'phosphatidyl' part of the name of phospholipids refers to ? the phosphate-glycerol-fatty acid portion of the molecule
fatty acids hydrocarbon chains with a -COOH group at one end (which become attached to glycerol via their -COOH groups
Created by: MamaSadie
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