3. 1. 6 APT

Question 1

What is a single molecule of Adenosine Triphosphate (ATP)?

Answer 1

A single molecule of ATP is a nucleotide derivative.

Question 2

What is a single molecule of ATP formed from?

Answer 2

A single molecule of ATP is formed from a molecule of ribose, a molecule of adenine and three phosphate groups.

Question 3

What does the hydrolysis of ATP break down into?

Answer 3

The hydrolysis of ATP is broken down to adenosine diphosphate (ADP) and and inorganic phosphate group (Pi).

Question 4

What is the hydrolysis of ATP to ADP and Pi catalysed by?

Answer 4

It is catalysed by the enzyme ATP hydrolase.

Question 5

is energy required in the hydrolysis of ATP?

Answer 5

Yes

Question 6

What is the inorganic phosphate (Pi) released during the hydrolysis of ATP used for?

Answer 6

Pi can be used to phosphorylate of other compounds, often making them more reactive.

Question 7

What is phosphorylation mean?

Answer 7

Phosphorylation is the attachment of a phosphate group to a molecule or an ion.

Question 8

How can ATP be resynthesised?

Answer 8

By the condensation of ADP and Pi.

Question 9

What is the resynthesis of ATP reaction catalysed by?

Answer 9

It is catalysed by the enzyme ATP syntheses during photosynthesis or respiration.

Question 10

ATP is useful in many biological processes. Explain why. (4 marks)

Answer 10

• Releases energy in small/manageable amounts
• Broken down in one step
• Immediate energy compound
• Phosphorylates substances
• can be reformed