The amount of energy extracted from a glucose molecule during respiration without oxygen is
Correct answer: B. 2%
- A. 4%
- B. 2%
- C. 6%
- D. 8%
Explanation
During anaerobic respiration, such as in fermentation processes, only about 2% of the energy stored in a glucose molecule is extracted. This is because anaerobic pathways do not fully oxidize glucose and thus capture less energy compared to aerobic respiration, which yields about 38% of energy. The incorrect options (4%, 6%, and 8%) overestimate the energy yield of anaerobic respiration.
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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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