The reactions of the Krebs cycle
A)take place in the cytosol of human cells.
B)generate ATP directly by substrate-level phosphorylation.
C)are important for the metabolism of carbohydrates but not other molecules.
D)take place only when no oxygen is present.
E)produce pyruvate and lactate as end products.

Question

Quizplus · Accepted Answer

The reactions of the Krebs cycle generate ATP directly by substrate-level phosphorylation. Option A is incorrect as these reactions take place in the mitochondrial matrix, not in the cytosol. Option C is incorrect as these reactions are involved in the metabolism of not only carbohydrates but also fats and proteins. Option D is incorrect as the Krebs cycle requires oxygen to proceed. Option E is incorrect as the end products of the Krebs cycle are carbon dioxide, ATP, and electron carriers (NADH and FADH2), not pyruvate and lactate.

The Reactions of the Krebs Cycle