Biology Bioenergetics NUMS 2024
PMDC Verified Question 7 of 67
During glycolysis, isomerization takes place in the form of:
A
Dihydroxyacetone phosphate and 2-phosphoglcerate
B
G3P and fructose 6-phosphates
C
PEP and pyruvate
D
Fructose 6-phosphate and 3-phosphoglycerate
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: G3P and fructose 6-phosphates
Concept:

Isomerases are enzymes that rearrange the atomic structure of a molecule without adding or removing atoms, converting it into its isomer.

Solution:

  • During glycolysis, two major classical isomerization reactions occur:
  • 1. Glucose 6-phosphate is isomerized into Fructose 6-phosphate by phosphoglucose isomerase.
  • 2. Dihydroxyacetone phosphate (DHAP) is isomerized into Glyceraldehyde 3-phosphate (G3P) by triose phosphate isomerase.
  • Option B correctly pairs molecules that are products of these specific isomerization steps in the glycolytic pathway.


Why other options are incorrect:

  • PEP and pyruvate involve a kinase (phosphate transfer), not an isomerase.
  • 3-phosphoglycerate and 2-phosphoglycerate involve a mutase, which is a subtype of isomerase, but the pairings in the other options incorrectly mix non-isomeric steps.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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