Serine or cysteine may enter the citric acid cycle as acetyl-CoA after conversion to:

Question

Quizplus · Accepted Answer

Serine can be converted to pyruvate through a series of reactions, while cysteine can be converted to pyruvate or to other intermediates of the citric acid cycle via various pathways. Once converted to pyruvate, it can enter the citric acid cycle and form acetyl-CoA through a reaction with pyruvate dehydrogenase. Therefore, option C is the correct answer.

Serine or Cysteine May Enter the Citric Acid Cycle as Acetyl-CoA