ATP Exam Questions

Describe how an atp molecule is formed from its component molecules

Adenine

Ribose

Three phosphates

Condensation reaction

ATP synthase

Name the two products of ATP hydrolysis

ADP and inorganic phosphate (Pi-)

Give two ways in which ATP is a suitable energy source for cells to use

Releases small amounts of energy so little energy is lost as heat

Releases energy immediately so energy is readily available

Phosphorylates other compounds, making them more reactive

Describe how ATP is resynthesised in cells

From ADP and phosphate ion

By ATP synthase

During respiration/photosynthesis

Give two ways in which the hydrolysis of ATP is used in cells

To provide energy for other reactions

To add phosphate to other substances and make them more reactive

Describe the structure of ATP

Outline how names enzymes break down and resynthesise ATP (4 marks)

Ribose

Adenine

3 phosphates

ATP+water→ADP+Pi by ATP hydrolase in hydrolysis reaction

ADP+Pi→ ATP+water by ATP synthase in condensation reaction

Catalyses the synthesis of ATP:

-Active site complementary to ADP+Pi

-Enzyme-substrate complex forms

Allows the movement of H+ ions

-channel allows facilitated diffusion of H+ ions