Which of the following events takes place in the electron transport chain?
A) the breakdown of glucose into six carbon dioxide molecules
B) the breakdown of an acetyl group to carbon dioxide
C) the harnessing of energy from high-energy electrons derived from glycolysis and the citric acid cycle
D) substrate-level phosphorylation

Question

Quizplus · Accepted Answer

The electron transport chain is responsible for harnessing energy from high-energy electrons derived from glycolysis and the citric acid cycle.

Answer: D 
 Substrate-level phosphorylation is not part of the electron transport chain, it occurs during glycolysis and the citric acid cycle when a high-energy phosphate group is transferred directly to ADP to form ATP. A is incorrect because the breakdown of glucose into six carbon dioxide molecules occurs during the citric acid cycle. B is also incorrect because the breakdown of an acetyl group to carbon dioxide occurs during the citric acid cycle, not the electron transport chain.

Which of the Following Events Takes Place in the Electron