C1.2 Krebs cycle

Question 1

What happens in first stage of Krebs cycle?

Answer 1

acetyl-CoA produced in link reaction will attach to oxaloacetate

Question 2

What happens after acetyl-CoA attaches to oxaloacetate (KB)?

Answer 2

CoA comes off forming just 6 carbon molecule (2 from acetyl-CoA and 4 from oxaloacetate)

Question 3

What happens to 6 carbon molecule (KB)?

Answer 3

is decarboxylated forming 5C + CO2, NAD —> NADH

Question 4

What happens after first oxidation and decarboxylation (KB)?

Answer 4

another decarboxylation and oxidation forming 4 carbon molecule

Question 5

How Krebs cycle closes?

Answer 5

after producing 4 carbon: NAD and FAD are reduced, ATP is formed from ATP goes back to oxaloacetate

Question 6

What are the final products of 1 Krebs cycle?

Answer 6

2 x CO2, ATP, FADH, 3 x NADH

Question 7

How many times cycle repeats per glucose molecule?

Answer 7

twice, because one glucose forms two pyruvates, which forms 2 CoA to use in one Krebs cycle