Complete Oxidation of Glucose to CO₂ involves Two Different Mechanisms

Complete oxidation of glucose to CO₂ involves two different mechanisms for synthesizing ATP: oxidative phosphorylation and substrate-level phosphorylation. Substrate-level phosphorylation:

A) requires activity of the enzyme ATP synthase.
B) occurs in the mitochondria.
C) occurs across the inner mitochondrial membrane.
D) requires an electron transport chain.
E) occurs in the cytosol.