3.1.8 ATP

Question 1

Describe how an ATP molecule is formed from its component molecules.

Answer 1

Adenine, ribose and three phosphate groups
Condensation reaction
ATP synthase

Question 2

The new antibiotic is safe to use in humans because it does not inhibit the ATP synthase found in human cells.
Suggest why human ATP synthase is not inhibited and bacterial synthase is inhibited.

Answer 2

Human ATP synthase has a different tertiary structure to bacterial ATP synthase

Question 3

ATP is an energy source used in many cell processes. Give four ways in which ATP is a suitable energy source for cells to use.

Answer 3

1. Releases relatively small amount of energy
2. Releases energy instantaneously;
3. Phosphorylates other compounds, making them more reactive;
4. Can be rapidly re-synthesised;

Answer 4

1. To provide energy for other reactions respiration/photosynthesis;
2. To add phosphate to other substances and make them more reactive/change their shape