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Flashcards in Biological Membranes and Transport Deck (10)
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1

amphipathic molecules

All of the lipid molecules in cell membranes are amphipathic (or amphiphilic)—that is, they have a hydrophilic (“water-loving”) or polar end and a hydrophobic (“water-fearing”) or nonpolar end. The most abundant membrane lipids are the phospholipids. These have a polar head group and two hydrophobic hydrocarbon tails.

2

liposome

spherical vesicle having at least one lipid bilayer

3

all transmembrane proteins are also know as

integral membrane proteins

4

a phospholipid with cholesterol has w flexible or rigid membrane

rigid

5

a sphingolipid with cholesterol has a flexible or rigid membrane

flexible

6

exocytosis

intracellular vesicle moves to the plasma membrane and subsequent fusion of the vesicular membrane and plasma membrane ensues

7

endocytosis

cells absorb molecules by engulfing them

8

Flippase

moves a membrane lipid from the outside layer to the inside layer, uses ATP

9

Floppase

moves a membrane lipid from the inside layer to the outside layer, uses ATP

10

Scramblase

moves one membrane lipid out and one in, uses Ca++