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Which of the metabolites is common to respiration mediated breakdown of fats, carbohydrates and proteins?

1. Fructose 1, 6 - bisphosphate
2. Pyruvic acid
3. Acetyl CoA
4. Glucose - 6 - phosphate

Correct answer: Acetyl CoA

Solution

Acetyl CoA is the common metabolic intermediate produced from carbohydrates, fats, and many proteins before entering the citric acid cycle. It serves as the central link between these breakdown pathways and aerobic respiration.

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