The immediate source of energy for cellular metabolism is
Correct answer: C. ATP
- A. Lipids
- B. Carbohydrates
- C. ATP
- D. Proteins
Explanation
ATP (adenosine triphosphate) is the immediate source of energy for cellular metabolism because it directly powers cellular activities by releasing energy upon the hydrolysis of its phosphate bonds. Other options, such as lipids and carbohydrates, are involved in energy storage and production but do not directly provide immediate energy to cells. Lipids are used for long-term energy storage, carbohydrates are metabolized to produce ATP, and proteins primarily serve structural and functional roles, not as direct energy sources.
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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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