The enzyme that converts pyruvate into acetyl-CoA requires vitamin B ₁, also called thiamine. Vitamin B ₁ has to be obtained through the diet. At what phase would cellular respiration come to a halt without B ₁? A) Glycolysis B) Preparatory reaction C) Citric acid cycle D) Electron transport chain E) Carbon fixation

Question

Quizplus · Accepted Answer

The enzyme that converts pyruvate into acetyl-CoA, which is necessary for the citric acid cycle, requires thiamine (vitamin B1). Without thiamine, the preparatory reaction that converts pyruvate into acetyl-CoA cannot occur, halting cellular respiration at this phase before the citric acid cycle begins.

The Enzyme That Converts Pyruvate into Acetyl-CoA Requires Vitamin B