ATP and energy

Question 1

What is the structure of ATP (adenosine triphosphate)

Answer 1

Nucleotide derivative

-Adenine

-ribose

• Three phosphate groups

Question 2

Describe the hydrolysis of ATP

Answer 2

• Hydrolysed into ADP > adenosine diphosphate and an inorganic phosphate (pi)
• Catalysed by the enzyme ATP hydrolyse

Question 3

What is the relationship between ATP and energy required reactions? (2)

Answer 3

• Hydrolysis of ATP can be coupled to energy-requiring reactions within cells e.g. Na+ K+ pump
• Inorganic phosphate released during the hydrolysis of ATP can be transferred to another molecule > making them more reactive
  (Phosphorylation)

Question 4

How is ATP re synthesised?

Answer 4

• Condensation reaction of ADP Pi
• Catalysed by enzyme ATP synthase

(In either photosynthesis or respiration)

Question 5

Why is ATP a suitable source of energy?

Answer 5

• Single step process >immediate energy
• Soluble
• small , manageable amounts of energy