Substrate- level phosphorylation occurs within a metabolic pathway where sufficient energy is released by a given chemical reaction to drive the synthesis of ATP from ADP and phosphate. Substrate- level phosphorylation is seen in which metabolic pathways)?
A) Krebs cycle
B) electron transport chain
C) both glycolysis and the Krebs cycle
D) glycolysis
E) All of the above pathways involve steps where substrate level phosphorylation takes place.

Question

Quizplus · Accepted Answer

Substrate-level phosphorylation occurs in both glycolysis and the Krebs cycle, as there are steps in these metabolic pathways where sufficient energy is released to power the synthesis of ATP from ADP and phosphate. While ATP synthesis also occurs in the electron transport chain, it does not involve substrate-level phosphorylation. Therefore, the correct answer is C.

Substrate- Level Phosphorylation Occurs Within a Metabolic Pathway Where Sufficient