1.3.2 - ATP

Question 1

structure of ATP

Answer 1

ribose sugar
3 phosphate groups
A nitrogenous base (adenine)

Question 2

Where is the energy used to synthesise ATP from?

Answer 2

From the energy provided by respiration

Question 3

What does ATP supply for cells?

Answer 3

An immediate supply of energy

Question 4

What two reactions change the number of phosphates on ATP and ADP?

Answer 4

Condensation adds a phosphate to ADP.
Hydrolysis takes a phosphate from ATP.

Question 5

What is the reversible reaction between ATP and ADP?

Answer 5

ATP + water — ADP + Pi

Question 6

Properties of ATP

Answer 6

Small and soluble so easily transported
Only one phosphate has to be hydrolysed so is a quick release of energy.
Can’t pass out of a cell so is an immediate supply of energy

Question 7

Examples of purines and pyrimidines.

Answer 7

Purines - adenine and guanine
Pyrimidines - cytosine, thymine and uracil

Question 8

What is ATPase?

Answer 8

The enzyme that catalyses the breakdown of ATP

Question 9

What is ATP synthase?

Answer 9

Catalyses the synthesis of ATP