Question

question 13 (1 point)
which of the following stages does not release any carbon
as carbon dioxide?

glycolysis
pyruvate oxidation
citric acid cycle
both b and c

Explanation:

To solve this, we analyze each stage:

• Glycolysis: Breaks down glucose into pyruvate, producing ATP and NADH, but no \(CO_2\) is released.
• Pyruvate oxidation: Pyruvate is converted to acetyl - CoA, and \(CO_2\) is released (one carbon per pyruvate).
• Citric acid cycle: Acetyl - CoA is oxidized, and \(CO_2\) is released (two carbons per acetyl - CoA).

Since glycolysis does not release \(CO_2\), while pyruvate oxidation and the citric acid cycle do, the stage that does not release carbon as \(CO_2\) is glycolysis.

Answer:

A. glycolysis