GCE Biology 2025 Objective — Question 9
Question 9 of 50 from the General Certificate of Education (GCE) Biology 2025 Objective paper, with the correct answer and a full explanation.
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How many molecules of oxygen are required for the aerobic respiration of three molecules of glucose?
- A. 3
- B. 6
- C. 12
- D. 18Correct
Explanation
The general equation for aerobic respiration is C6H12O6 + 6O2 -> 6CO2 + 6H2O. From the equation, 1 molecule of glucose takes 6 molecules of oxygen. Thus, for 3 molecules of glucose, the required number of oxygen molecules = 3 x 6 = 18.
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