ATP

Question 1

Describe how an ATP molecule is formed from its component molecules (4 marks)

Answer 1

• Adenine, ribose, and 3 phosphates
• Condensation reaction
• ATP synthase

Question 2

ATP is an energy source used in many cell processes. Give 2 was in which ATP is a suitable energy source for cells to use ( 2 marks)

Answer 2

• Releases relatively small amount of energy
• Releases energy instantaneously
• Phosphorylates other compounds, making them more reactive
• Can be rapidly re-synthesised
• Is not lost from the cells

Question 3

Describe how ATP is resynthesised in cells (2 marks)

Answer 3

• From ADP and Pi
• By ATP synthase
• During respiration/ photosynthesis

Question 4

Explain the importance of ATP to an organism

Answer 4

• ATP is the universal energy currency of a cell
• ATP provides a direct source of energy for cellular process, including active transport and muscle contraction
• ATP is essential for metabolic reactions, such as protein synthesis and DNA replication