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4. Which of the following statements is (are) true concerning the citric acid cycle? a. The...

4. Which of the following statements is (are) true concerning the citric acid cycle? a. The citric acid cycle is a strictly aerobic pathway b. In the Citric acid cycle, acetyl Co A is oxidized to CO2 c. The electron carriers NAD+ and FAD are used in the citric acid cycle d. all of the above e. none of the above

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Answer #1

Answer: D: All the options are correct

Explanation:

  1. While as glycolysis is both aerobic and anaerobic, citric acid cycle is strictly aerobic. If oxygen is not present, ETC will halt resulting in non-production of NAD. This in turn will divert glycolysis to produce lactic acid and no pyruvate, the latter is very essential component of TCA cycle. Thus, TCA cycle is seriously dependent on oxygen. Therefore, strictly aerobic in nature unlike glycolysis.
  2. In the Citric acid cycle, acetyl Co A is oxidized to CO2 and this occurs by the enzyme alpha ketoglutarate dehydrogenase
  3. The electron carriers NAD+ and FAD are used in the citric acid cycle. NAD+ is used at steps 3, 4 and 8 while as FAD is used at 6th step
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