Link Reaction And Krebs cycle Flashcards
1
Q
What happens to pyruvate and NADH after glycolysis?
A
- They are actively transported from the cytoplasm to the mitochondrial matrix
2
Q
What happens to pyruvate in the link reaction?
A
- Oxidised to acetate
3
Q
What happens to the h+ lost during the oxidation of pyruvate?
A
- Nad picks up the hydrogen and becomes NADH
4
Q
What happens to acetate in the link reaction?
A
- Acetate combines with coenzyme A to produce acetal coenzyme A
5
Q
How many times does the link reaction occur for every glucose molecule?
A
- Twice
6
Q
What is made at the end of the link reaction?
A
- 2 x acetal coenzyme A
- 2x carbon dioxide
- 2x NADH
7
Q
What does acetal coenzyme A then react with? And what does it release?
A
- Reacts with a 4 carbon molecule
- releasing coenzyme A and producing a 6 carbon molecule that enters the Krebs cycle
8
Q
What happens to the coenzyme A after it is released?
A
- it recycles back into the link reaction.
9
Q
How do we go from a 6 carbon molecule to a 4 carbon molecule?
A
- By a series of redox reactions
10
Q
What does the Krebs cycle generate?
A
- Reduced coenzymes and ATP by substrate level phosphorylation
- carbon dioxide is lost
11
Q
How many cycles of the Krebs cycle are there for 1 molecule of glucose?
A
-2 cycles
