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As the citric acid cycle proceeds from the entry of acetyl CoA to the production of succinate, two carbons enter the cycle and two carbons are released as CO2. Why is the cycle not considered complete at this point?
A) Not enough energy has been generated from the cycle at this stage.
B) The cell requires FADH2, which is produced by subsequent reactions of the cycle.
C) The oxaloacetate used to initiate the cycle must be regenerated.
D) Not enough NADH has been generated from the cycle at this stage.

Respuesta :

Answer:

The correct answer will be option-C

Explanation:

Citric acid cycle or Krebs cycle is one of the stages of cellular respiration, which represents the set of reaction in a cyclic manner.

The Krebs cycle takes place in the Mitochondrial matrix where Acetyl-CoA (2 carbon compound) reacts with oxaloacetate (4 carbon compound) and form a 6 Carbon compound citrate which further gets converted to succinate. Till succinate, the entered carbon gets released in the form of carbon dioxide but the cycle does not appear to be complete.

The cycle is considered incomplete as the oxaloacetate which accepts the 2 carbon compound called Acetyl-CoA is not regenerated without which the cycle will be at a halt. So, the regeneration of oxaloacetate is required to maintain the continuity of the cycle.

Thus, option-c is the correct answer.

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