Pyruvate is converted to a two-carbon acetyl group attached to coenzyme A (CoA), and CO₂ is given off. This phase is called A) substrate-level ATP synthesis. B) the preparatory reaction. C) the electron transport chain. D) the citric acid cycle. E) fermentation.

Question

Quizplus · Accepted Answer

The conversion of pyruvate to acetyl-CoA is called the preparatory reaction as it prepares the acetyl group for entry into the citric acid cycle. Substrate-level ATP synthesis and fermentation involve the production of ATP from glucose, while the electron transport chain is the process by which ATP is produced in oxidative phosphorylation. The citric acid cycle occurs after the preparatory reaction and involves the oxidation of the acetyl group. Thus, B is the best choice.

Pyruvate Is Converted to a Two-Carbon Acetyl Group Attached to Coenzyme