4.1

Question 1

What is the role of phospholipids?

Answer 1

Their tails form a hydrophbic core that prevents entry of large hydrophilic substances

Question 2

What is the role of sterols?

Answer 2

Maintain appropriate membrane fluidity

Question 3

What is the role of glycoproteins and glycolipids?

Answer 3

Cell-cell recognition

Question 4

What is an antigen?

Answer 4

A molecule with a particular r that that can recognise and respond to foreign substances

Question 5

What is an antibody?

Answer 5

A special protein made by our immune system that can specifically bind a particular antigen and directs out immune system to attack

Question 6

What different antigens do the different blood groups have?

Answer 6

A= A antigen
B= B antigen
AB = A & B antigens
O= none

Question 7

What is the role of proteins in the bilayer?

Answer 7

Integral proteins penetrate or cross the bilayer
Peripheral are bound to the surface either by attaching to integral proteins or having one or more hydrocarbon tails
And allow for signal transduction

Question 8

Why is membrane fluidity important?

Answer 8

Helps small molecules cross the membrane
Helps molecules move around the membrane
Helps protein undergo conformational change
Helps the entire membrane move around / change shape