Which molecule serves as the primary energy carrier in cells?
Correct answer: A. ATP
- A. ATP
- B. NADH
- C. Glucose
- D. FADH₂
Explanation
ATP is the primary energy carrier in cells. It stores energy in its high-energy phosphate bonds and releases it to power essential cellular activities such as muscle contraction, active transport, and biosynthesis. Other molecules like glucose, NADH, and FADH₂ play roles in storing or transferring energy, but ATP is the form that cells directly use.
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About Bioenergetics
Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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