Topic: Amphibolic pathway and respiratory quotient· Plant Physiology

Which of the following biomolecules 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

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Answer: 3. Acetyl CoA

Carbohydrates, fats and proteins are all finally oxidised through the Krebs cycle, which they enter as acetyl CoA.

Pyruvic acid and fructose 1,6-bisphosphate come only from carbohydrate breakdown (glycolysis); fats give fatty acids and glycerol, and proteins give amino acids that enter at different points but all converge on acetyl CoA or Krebs intermediates.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Which of the following biomolecules is common to respiration-mediated breakdown of fats, carbohydrates and proteins?

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