Electron Transfer Phosphorylation Yields ____ ATPs

Question

Electron transfer phosphorylation yields ____ ATPs.  
A) four
B) Two
C) Three
D) 32
E) Zero

Accepted Answer

Electron transfer phosphorylation, also known as oxidative phosphorylation, yields 32 ATPs per glucose molecule. This occurs during the final stage of cellular respiration, in which electrons are transferred from electron carriers (such as NADH and FADH2) to the electron transport chain, resulting in the pumping of protons across the mitochondrial membrane. The eventual flow of these protons back across the membrane drives ATP synthesis through the enzyme ATP synthase.