3. Plasma Membrane - Class 2 - 09/09/2024

Question 1

Integral proteins are also called

Answer 1

Trans-membrane proteins

Question 2

The lipid bilayer is about

Answer 2

5 nm

Question 3

Characteristics of plasma membrane

Answer 3

1. Fluidity
2. Asymmetry

Question 4

Composition of plasma membrane

Answer 4

1. Membrane lipids (continuous double layer)
2. Membrane proteins
3. Membrane carbohydrates

Question 5

Control and regulate the stability of the plasma membrane

Answer 5

Cholesterol

Question 6

Types of membrane proteins by function

Answer 6

1. Transporters
2. Linkers
3. Receptors
4. Enzymes

Question 7

Types of membrane proteins by binding patterns

Answer 7

1. Integral proteins
2. Peripheral proteins
3. Lipid-linked proteins (rests peripherally, but can bind to lipids of the membrane by non-covalent bonds)

Question 8

Fluidity of lipid molecules in lipid bilayer

Answer 8

1. Lateral diffusion (easiest)
2. Flip-flop (most difficult - requiring a lot more energy)
3. Rotation
4. Flexion

Question 9

Factors affecting fluidity of membrane lipids

Answer 9

1. Saturation degree of hydrocarbon tail
2. Length of hydrocarbon tail
3. Dual regulatory role of cholesterol
4. Ratio of lecithin vs sphingomyelin
5. Influence of membrane proteins

Question 10

Highest frequency lipid movements of lipid membrane
&
The only movements possible by membrane proteins

Answer 10

1. Lateral diffusion
2. Rotation

Question 11

FRAP means

Answer 11

Fluorescence recovery after photobleaching

Question 12

FLIP means

Answer 12

Fluorescence loss in photobleaching