Unit 1 Biology January 2012

The following cell membrane diagram should be used to answer Questions 1 to 3:

1. The phospholipids form a bilayer because

2. The protein, labelled in the diagram, could be involved in

3. The fluidity of the membrane is determined by the proportion of

The following diagram must be used to answer Questions 4 to 7:

4. The graph shows that

5. The country with the highest percentage of males who are obese is

6. The country with the same percentage of females as the UK who are overweight is

7. In the USA, the ratio of overweight males to females is