In anaerobic respiration, only _ % of the energy present within the chemical bond of glucose is converted into ATP.
Correct answer: B. 2%
- A. 5%
- B. 2%
- C. 7%
- D. 10%
Explanation
In anaerobic respiration, the process primarily involves glycolysis followed by fermentation, which yields only a small amount of ATP compared to aerobic respiration. Specifically, about 2% of the energy in glucose is transformed into usable ATP, while the rest is lost as heat. This is significantly lower than aerobic respiration, which can convert around 30-32% of the energy in glucose. The incorrect options (5%, 7%, and 10%) overestimate the efficiency of anaerobic pathways, which are limited by the lack of oxygen and the nature of the fermentation processes involved.
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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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