Substrate-Level Phosphorylation ____

Question

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) occurs in the mitochondria

Accepted Answer

Substrate-level phosphorylation occurs during glycolysis, where ATP is directly synthesized by transferring a phosphate group from a substrate molecule to ADP. It does not require the presence of oxygen and is not the major source of ATP produced in aerobic respiration, which mainly involves oxidative phosphorylation.