Biology Bioenergetics UHS 2022
PMDC Verified Question 52 of 67
Electron transport chain explains:
A
Photophosphorylation
B
Z-scheme
C
Photolysis
D
Mechanism of ATP synthesis
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Mechanism of ATP synthesis
Concept:

The ETC is fundamentally coupled to chemiosmosis, providing the energy required to synthesize ATP.

Solution:

  • As electrons move energetically downhill along the ETC, they release energy.
  • This energy is used to pump protons across a membrane, creating an electrochemical gradient.
  • The flow of protons back across the membrane through ATP synthase explains the primary mechanism of ATP synthesis.


Why other options are incorrect:

  • While the ETC is involved in photophosphorylation and the Z-scheme, its universal biological role (in both mitochondria and chloroplasts) is explaining the mechanism behind bulk ATP synthesis.

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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