ATP

Question 1

Structure of ATP

Answer 1

Ribose bound to a molecule of adenine and 3 phosphate groups

Nucleotide derivative

Question 2

Describe how ATP is broken down

Answer 2

ATP + water → ADP + Pi

Hydrolysis reaction using a water molecule

Catalysed by ATP hydrolase

Question 3

Ways which hydrolysis of ATP is used in cells

Answer 3

Energy requiring reactions in cells

Pi released used to phosphorylate to other compounds making them more reactive

Question 4

How is ATP is resynthesised in cells

Answer 4

ADP + Pi → ATP

Condensation reaction removing a water molecule

Catalysed by ATP synthase

During respiration and photosynthesis

Question 5

How do the properties of ATP make it a suitable immediate source of energy for cells

Answer 5

Releases energy in relatively small amounts

Single reaction to release energy so immediate release

Cannot pass out of cell