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 pathway(s)?
A)glycolysis
B)Krebs cycle
C)both glycolysis and the Krebs cycle
D)electron transport chain
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. It is a mechanism where a phosphate group is transferred from a high-energy substrate directly to ADP to form ATP. The electron transport chain does not involve substrate-level phosphorylation, but rather oxidative phosphorylation where ATP is synthesized using energy from the electrochemical gradient established by the electron carriers.

Substrate-Level Phosphorylation Occurs Within a Metabolic Pathway Where Sufficient Energy