Link reaction and Krebs cycle Quiz
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5 questions, one answer each
Each answer is checked as you go, with why.
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1. What happens to pyruvate in the link reaction?
- A. It is reduced to lactate
- B. It is oxidised to acetate with loss of CO₂
- C. It is phosphorylated
- D. It is split into triose phosphate
2. What is the first six-carbon product of the Krebs cycle formed from?
- A. Pyruvate and CO₂
- B. Acetylcoenzyme A and a four-carbon molecule
- C. Glucose and ATP
- D. Acetate and oxygen
3. How many carbon dioxide molecules does one turn of the Krebs cycle release?
- A. 1
- B. 2
- C. 3
- D. 6
4. Which coenzymes are reduced in the Krebs cycle?
- A. NAD and FAD
- B. ATP and ADP
- C. Coenzyme A and acetate
- D. NADP and FAD
5. Why does the Krebs cycle stop without oxygen?
- A. Oxygen is a substrate
- B. Reduced NAD and FAD cannot be re-oxidised, so NAD and FAD run out
- C. Pyruvate cannot be made
- D. ATP is not used