1.6

Question 1

Describe the structure of adenosine triphosphate (ATP)

Answer 1

nucleotide derivative of adenine with 3 phosphate groups

Question 2

Explain the role of ATP in cells

Answer 2

ATP hydrolase catalyses ATP -> ADP + Pi
-energy released is coupled to metabolic reactions
-phosphate group phosphorylates compounds to make them more reactive

Question 3

How is ATP resynthesised in cells

Answer 3

-ATP Synthase catalyses condensation reaction between ADP and Pi
-during photosynthesis and respiration

Question 4

Explain why ATP is suitable as the energy currency of cells

Answer 4

-high energy bonds between phosphate groups
-small amounts of wasted energy released at a time = less energy wasted as heat
-Single step hydrolysis = energy available quickly
-readily resynthesised