Biology Bioenergetics DUHS 2022
PMDC Verified Question 66 of 67
Pyruvic acid is acid of:
A
4 carbon compound
B
5 carbon compound
C
6 carbon compound
D
3 carbon compound
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: 3 carbon compound
Concept:

Glycolysis is the splitting of a single sugar molecule into two smaller molecules.

Solution:

  • Glucose is a 6-carbon sugar.
  • During glycolysis, it is ultimately split into two molecules of pyruvic acid.
  • Therefore, each pyruvic acid molecule is a 3-carbon compound.


Why other options are incorrect:

  • 4-carbon compounds are typical in the Krebs cycle (e.g., oxaloacetate).
  • 5-carbon compounds include RuBP (Calvin cycle) or alpha-ketoglutarate (Krebs cycle).
  • 6-carbon compounds include glucose and citrate.

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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