Which of the following steps in the citric acid cycle directly produces a molecule of ATP (or GTP)?
A) Citrate → isocitrate
B) Succinate → fumarate
C) Malate → oxaloacetate
D) Succinyl CoA → succinate
E) Isocitrate → α-ketoglutarate

Question

Quizplus · Accepted Answer

The conversion of Succinyl CoA to succinate in the citric acid cycle involves the substrate-level phosphorylation that directly produces a molecule of GTP (guanosine triphosphate), which can be readily converted to ATP (adenosine triphosphate). This is the only step in the citric acid cycle that directly produces a molecule of ATP or GTP.

Which of the Following Steps in the Citric Acid Cycle