Topic I Booklet

Question 1

State and explain the property of water that can help to buffer changes in temperature

Answer 1

1. High specific heat capacity
2. Can gain energy without changing temperature

Question 2

Name the chemical element found in all amino acids that is not found in triglycerides

Answer 2

Nitrogen

Question 3

When do you use student’s t-test?

Answer 3

When looking for differences between two means

Question 4

Give two properties of water that are important in the cytoplasm of cells

Answer 4

1.High specific heat capacity
2. Act as a temperature buffer

Question 5

Compare and contrast the processes by which water and inorganic ions enter cells

Answer 5

1. Both move down concentration gradient
2. Both move through channels in membrane
3. Ions can move against a concentration gradient by active transport

Question 6

Describe how bacteria divide

Answer 6

1. Binary fission
2. Division of cytoplasm to produce 2 daughter cells

Question 7

Suggest one advantage to a bacterium of secreting an extracellular protease in its natural environment

Answer 7

1. To digest protein
2. So they can absorb amino acids. For growth

Question 8

Describe the action of membrane-bound dipeptidases and explain their importance

Answer 8

1. Hydrolyse peptide bonds to release amino acids
2. Amino acids cannot cross cell membrane