Question

unit 2 exam 2025-26
water is an end product in
○ glycolysis
○ electron transport chain
○ krebs cycle
○ fermentation

Explanation:

In cellular respiration, the electron transport chain is the final stage. Oxygen acts as the final electron acceptor. When electrons are passed through the electron - transport chain and combine with oxygen and hydrogen ions, water is formed as an end - product. Glycolysis produces pyruvate, ATP, and NADH. The Krebs cycle produces carbon dioxide, ATP, NADH, and FADH₂. Fermentation produces either lactic acid or ethanol and carbon dioxide.

Answer:

B. Electron Transport Chain