2.1.2 - Cell membranes

Question 1

Functions of the cell membrane?

Answer 1

Control what substances enter/leave the cell
Allow recognition by other cells e.g. by the immune system
Allow cells to communicate

Question 2

Describe the phospholipid bilayer.

Answer 2

Phosphate heads of phospholipids are hydrophilic and fatty acids are hydrophobic.
Allow passage of lipid soluble substances

Question 3

Function of intrinsic proteins in the cell membrane.

Answer 3

Act of protein channels to transport substances across the membrane.

Question 4

Function of extrinsic proteins in the cell membrane.

Answer 4

Give mechanical support to the cell membrane.

Question 5

Function of cholesterol proteins in the cell membrane.

Answer 5

Stabalises cell membrane
Hydrophobic so prevents water loss
Makes the membrane less fluid at high temperatures

Question 6

Function of glycolipids proteins in the cell membrane.

Answer 6

Act as recognition sites

Question 7

Function of glycoproteins proteins in the cell membrane.

Answer 7

Act as recognition sites and help cells attach to one another.