7.4

Question 1

Name the site of glycolysis

Answer 1

The cytoplasm

Question 2

Describe the process of glycolysis (4 marks)

Answer 2

• glucose is converted to two molecules of glyceraldehyde 3-phosphate, using up 2 ATPs in the process
• each glyceraldehyde 3-phosphate is then converted to pyruvate with each reaction using 2ATPs and reducing one NAD
• net output is 2ATPs and 2NADH

Question 3

Explain why glucose must be phosphorylated by ATP in glycolysis

Answer 3

Destabilises the structure by adding a phosphate group from the ATP, allowing the conversion to pyruvate

Question 4

State the ratio of glucose to pyruvate produced in glycolysis

Answer 4

1:2 glucose:pyruvate

Question 5

State the net gain of ATP in glycolysis

Answer 5

+2ATPs