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Flashcards in Membrane Structure Deck (20):
1

Function of plasma membrane

1. Encloses the cell
2. Define its boundaries
3. Maintains essential differences between cytosol and extra ellipse environment.
4. Contains proteins that acts as a sensors of external signals.

2

Used to synthesize ATP, to drive transmembrane movement of selected salutes, to product electrical signals

Ion gradients

3

Thickness of cell membrane

5 nm

4

Dissolve readily in water

Hydrophilic molecules

5

Insoluble in water

Hydrophobic molecules

6

Two ways of how lipid molecules aggregate

1. Spherical micelles
2. Bilayers

7

Bonds that produce kinks

Cis double bonds

8

Composition of lipid bilayer

1. Phospholipids
2. Cholesterol
3. Glycolipids

9

Major phospholipids in plasma membrane of mammalian cell

Phosphatidylcholine
Phosphatidylethanolamine
Phosphatidylserine
Sphingomyeline

10

polypeptide that only crosses once

Single pass membrane proteins

11

The polypeptide chain crosses multiple times

Multi-pass transmembrane proteins

12

Polysaccharide chains of integral membrane

Proteoglycan

13

Carbohydrate rich zone on the cell surface. Cell coat

Glycocalyx

14

Have long attracted fatty hydrocarbon chains, holds adjacent molecules together transiently in small microdomains

Sphingolipid

15

Transient phase separations in the fluid lipid bilayer where sphingolipids become concentrated

Microdomains

16

Serves as a signal to induce neighboring cells to phagocytosis the death cell and digest it

Phosphatidylserine

17

Functions of glycolipids

1. Helps protect the membrane from harsh environments
2. Function in cell recognition process

18

Carbohydrate binding proteins

Lectins

19

Rotate to an axis perpendicular to the plane of the bilayer

Rotational diffusion

20

Consists of long polysaccharide chains linked covalently to a protein core, found mainly outside the cells

Proteoglycans