1.6 - ATP

Question 1

What chemical processes produces ATP?

Answer 1

1. Respiration and Photosynthesis

Question 2

What does ATP stand for?

Answer 2

1. Adenosine triphosphate

Question 3

1. Draw the molecule of ATP and label it

Answer 3

Check notes

Question 4

1. Write an equation to show how ATP releases energy

Answer 4

H2O + ATP ——> ADP + Pi

Question 5

1. What is the name of the enzyme which catalyses the hydrolysis of ATP?

Answer 5

ATP hydrolase

Question 6

1. What does ADP stand for?

Answer 6

Adenosine diphosphate

Question 7

1. What is Pi? What happens to the ‘Pi’ that is released? What is its function in cells?

Answer 7

• ‘Pi’ is inorganic phosphate. It is the phosphate ion (which has the formula PO43-)
• Phosphate can join onto molecules (phosphorylation) to make them more reactive
• It has lots of uses in cells, e.g.
  o In the phosphate-sugar backbone of DNA and RNA
  o In phospholipids

Question 8

1. During which processes is ATP resynthesised? What sort of reaction is this? What is the name of the enzyme which catalyses the reaction?

Answer 8

• ATP is synthesised primarily during respiration (also during photosynthesis)
• This is a condensation reaction
• The reaction is catalysed by ATP synthase

Question 9

1. What are the key features of ATP which make it an excellent source of energy for cellular reactions? MEMORISE THIS!!!!!

Answer 9

Releases energy in small / manageable amounts;
2. (Broken down) in a one-step / single bond broken;
3. Immediate energy compound / makes energy available rapidly;
4. Phosphorylates / adds phosphate;
5. Makes (phosphorylated substances) more reactive / lowers activation energy;
6. Reformed/made again;