NEET 2016 Phase 2 · BiologyPrevious Year Question
Which of the following biomolecules is common to respiration-mediated breakdown of fats, carbohydrates and proteins?
Answer: (D) Acetyl CoA. Answer: (D) Acetyl CoA.
- A.Glucose-6-phosphate
- B.Fructose 1,6-bisphosphate
- C.Pyruvic acid
- D.Acetyl CoA✓
Correct Answer
(D) Acetyl CoA
Solution & Explanation
Answer: (D) Acetyl CoA. Solution: Acetyl CoA is the common convergence point of all three substrate types: carbohydrates yield pyruvate (glycolysis) which is oxidatively decarboxylated to acetyl CoA, fatty acids are degraded directly to acetyl CoA, and amino acids (after deamination) enter as pyruvate or acetyl CoA. Glucose-6-phosphate and fructose 1,6-bisphosphate are exclusive to carbohydrate glycolysis, and although pyruvic acid is shared by carbs and some proteins, fats bypass it and enter only at acetyl CoA. NCERT: Ch 12, p.162, line ~20: "acetyl CoA and enter the pathway".
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