3.1.6 ATP

Question 1

What does the ATP molecule consist of?

Answer 1

• Adenine (nucleotide base)
• Ribose sugar
• 3 Phosphate groups

Question 2

What is the function of an ATP?

Answer 2

ATP is the immediate source of energy in a cell. Energy is released to a cell when a phosphate bond gets broken

Question 3

Describe how ATP is synthesised from ADP.

[3 marks]

Answer 3

• A condensation reaction…
• …occurs between ADP and inorganic phosphate.
• The reaction is catalysed by ATP synthase.

Question 4

Adenosine triphosphate (ATP) is a nucleotide derivative.
Contrast the structures of ATP and a nucleotide found in DNA to give two differences.
[2 marks]

Answer 4

2 max

• ATP has ribose and DNA nucleotide has deoxyribose.
• ATP has 3 phosphate (groups) and DNA nucleotide has 1 phosphate (group).
• ATP- base always adenine and in DNA nucleotide base can be different / varies.