Substrate-level phosphorylation
A)occurs during glycolysis.
B)requires the presence of oxygen.
C)is a precursor for the phosphorylation of glucose.
D)is the source for the majority of the ATP produced in aerobic respiration.
E)does not occur during the Krebs cycle.

Question

Quizplus · Accepted Answer

Substrate-level phosphorylation occurs during glycolysis, where phosphate groups are transferred from a substrate to ADP to form ATP. It does not require the presence of oxygen and is not a precursor for the phosphorylation of glucose. While it does contribute to ATP production in aerobic respiration, it is not the majority source, with oxidative phosphorylation in the electron transport chain contributing significantly more. Substrate-level phosphorylation also occurs in the Krebs cycle, so option E is incorrect.

Substrate-Level Phosphorylation