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AIIMS2017Botany-Metabolism

AIIMS 2017 Botany Glycolysis MCQ Question

Type: MCQ-conceptual-Medium-Class 11

Which one is correct sequence occurring in glycolysis?

A

G−6−P→PEP→3−PGAL→3−PGAG^{-6}-P → PEP →³⁻PGAL →³⁻PGA

B

G−6−P→3−PGAL→3−PGA→PEPG^{-6}-P →³⁻PGAL →³⁻PGA → PEP

C

G−6−P→PEP→3−PGA→3−PGALG^{-6}-P → PEP →³⁻PGA →³⁻PGAL

D

G−6−P→3−PGA→3−PGAL→PEPG^{-6}-P→³⁻PGA →³⁻PGAL → PEP

Correct Answer

Option C

Detailed Explanation

In glycolysis, glucose-6-phosphate (G⁻₆-P) is converted through a series of enzymatic reactions to phosphoenolpyruvate (PEP), with 3-phosphoglycerate (3-PGA) and glyceraldehyde-3-phosphate (3-PGAL) as intermediates. The correct sequence is G⁻₆-P → 3-PGAL → 3-PGA → PEP, as glycolysis involves the conversion of glucose derivatives into pyruvate while producing ATP and NADH. Options A and D incorrectly place 3-PGA and 3-PGAL in the wrong order, while option B misplaces PEP in the sequence. Understanding these steps is crucial for grasping the metabolic pathways of cellular respiration.

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