Biology Bioenergetics SZABMU 2024
PMDC Verified Question 10 of 67
The amount of energy present in bonds of glucose which is converted into ATP during anaerobic respiration is:
A
2%
B
4%
C
10%
D
36%
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: 2%
Concept:

Anaerobic respiration is an incredibly inefficient method of extracting the total potential chemical energy locked within the bonds of a glucose molecule.

Solution:

  • The complete aerobic oxidation of glucose captures a large percentage of its energy (around 36-40%).
  • However, during anaerobic respiration (fermentation), the glucose molecule is only partially broken down.
  • As a result, only a net of 2 ATP is produced, meaning only about 2% of the total potential energy in glucose is actually converted into usable ATP. The rest remains locked in the toxic byproducts (ethanol or lactic acid).


Why other options are incorrect:

  • 4%, 10%, and 36% grossly overestimate the thermodynamic efficiency of fermentation.

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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