Question

during which stage of cellular respiration is glucose broken down into two molecules of pyruvic acid?
electron transport chain
glycolysis
krebs cycle
acetyl coa formation

Explanation:

To solve this, we analyze each stage of cellular respiration:

• The electron transport chain is about ATP production using electron carriers, not glucose breakdown to pyruvic acid.
• Glycolysis is the initial stage where one glucose molecule is broken down into two pyruvic acid molecules.
• The Krebs cycle (Citric Acid Cycle) uses acetyl - CoA (derived from pyruvic acid) to produce electron carriers, not glucose breakdown to pyruvic acid.
• Acetyl CoA formation is the conversion of pyruvic acid to acetyl - CoA, not the breakdown of glucose to pyruvic acid.

Answer:

B. glycolysis