Substrate-level phosphorylation transfers phosphate groups directly from ____ to ADP.
A) a substrate
B) coenzymes
C) the electron transfer chain
D) ATP
E) the Krebs cycle

Question

Substrate-level phosphorylation transfers phosphate groups directly from ____ to ADP.
A) ​a substrate
B) ​coenzymes
C) ​the electron transfer chain
D) ​ATP
E) ​the Krebs cycle

Quizplus · Accepted Answer

Substrate-level phosphorylation directly transfers phosphate groups from a substrate molecule to ADP to form ATP. This process occurs during glycolysis and the Krebs cycle, where high-energy phosphate groups are cleaved from intermediate molecules and directly transferred to ADP. Coenzymes are not directly involved in substrate-level phosphorylation, and the electron transfer chain is involved in oxidative phosphorylation rather than substrate-level phosphorylation. ATP itself is not a source of phosphate groups during substrate-level phosphorylation.

Substrate-Level Phosphorylation Transfers Phosphate Groups Directly from ____ to ADP