Which process does not occur in the krebs cycle?
a. a 4-carbon molecule is recycled.
b. glucose is broken down into two pyruvate molecules.
c. pyruvate is broken down into a 2-carbon molecule and carbon dioxide.
d. citric acid is broken down, creating carbon dioxide as a waste product.

The correct answer is b glucose is broken down into two pyruvate molecules.

Explanation:

Krebs cycle is one of the most important step of aerobic respiraion.Krebs cycle occur within mitochondrial matrix.During krebs cycle the acetyl CoA generated from pyruvate reacts with oxalo acetate in a cyclic manner to regenerate 4 carbon compound oxaloacetate.

 During krebs cycle pyruvate is broken down or oxidized to form 2 carbon compound known as acetyl CoA and carbon dioxide as byproduct.

  But the breakdown of glucose into two pyruvate molecules occur during glycolysis.

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