Biology Bioenergetics SZABMU 2024
PMDC Verified Question 6 of 67
Which of the following steps of glycolysis does not involve ATP directly?
A
Conversion of Glucose to Glucose 6-phosphate
B
Conversion of Fructose 6-phosphate to Fructose 1,6-bisphosphate
C
Conversion of Glyceraldehyde 3-phosphate to 1,3- bisphosphoglycerate
D
Conversion of 1,3- bisphosphoglycerate to 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 C: Conversion of Glyceraldehyde 3-phosphate to 1,3- bisphosphoglycerate
Concept:

Glycolysis features specific steps that either consume ATP (kinases) or produce ATP via substrate-level phosphorylation.

Solution:

  • Step A consumes 1 ATP (Hexokinase).
  • Step B consumes 1 ATP (Phosphofructokinase).
  • Step D produces 1 ATP (Phosphoglycerate kinase).
  • Step C is an oxidation reaction catalyzed by GAPDH. It utilizes inorganic phosphate (Pi) from the cytosol and reduces \( NAD^+ \) to NADH. It does not directly involve ATP.


Why other options are incorrect:

  • Options A, B, and D all feature a direct physical interaction with ATP molecules.

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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