Number of ATP molecules used during the preparatory phase of glycolysis:
Correct answer: A. 2
- A. 2
- B. 4
- C. 1
- D. 6
Explanation
In glycolysis, the preparatory phase involves the conversion of glucose into two 3-carbon molecules known as glyceraldehyde-3-phosphate. This phase requires an investment of 2 ATP molecules to phosphorylate glucose and fructose-6-phosphate. The energy investment is necessary to destabilize the glucose molecule, making it more reactive and primed for subsequent breakdown. Options B, C, and D are incorrect because they do not accurately reflect the number of ATP molecules used in this phase of glycolysis.
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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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