1.3 Membrane Structure

Question 1

Membranes Can Be

Answer 1

-fluid
-flexible
-dynamic

Question 2

Membrane Contents

Answer 2

-Phospholypids
-Proteins
-Cholesterol

Question 3

Phospholipids

Answer 3

-lipid bilayers (lipids –> polar & phosphate –> non polar)
-lipids outside (hydrophyllic)
-phosphate inside (hydrophobic)

Question 4

Processes Performed

Answer 4

-Endocytosis
-Exocytosis

Question 5

Endocytosis

Answer 5

Taking in outside substances by engulfing them in membrane.

Question 6

Exocytosis

Answer 6

Eject substances from cell membrane.

Question 7

Channels

Answer 7

Passive transport of substances

Question 8

Carriers

Answer 8

Bind to substances and transport them to other side of membrane.

Question 9

Recognition

Answer 9

Help cell recognise self-cells and outside cells (for immune response).

Question 10

Receptor

Answer 10

Relay information from inside and outside of cell.

Question 11

Enzymes

Answer 11

Quicen rate of reaction in membrane.

Question 12

Cholesterol

Answer 12

-Controlls membrane fluidity and permeability
-Presence restricts movement of phospholipids
-Prevents solidification of membrane

Question 13

Daveson-Danielli Model

Answer 13

-two layers of polar lipid bilayers
-hydrophillic parts outside
-hydrophobic parts surrounded by hydrophillic
-bilayer is between two protein layers