Biology Bioenergetics SZABMU 2024
PMDC Verified Question 2 of 67
Which of the following receives electrons from \( FADH_2 \) during oxidative phosphorylation in cristae of mitochondria?
A
Cytochrome a
B
Coenzyme Q
C
Cytochrome c
D
Cytochrome b
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Coenzyme Q
Concept:

Electrons from different carriers enter the electron transport chain at different points based on their energy levels.

Solution:

  • While NADH delivers electrons to Complex I, \( FADH_2 \) possesses slightly less energy and bypasses Complex I entirely.
  • \( FADH_2 \) donates its electrons directly to Complex II.
  • From Complex II, the electrons are immediately passed to the mobile lipid carrier Coenzyme Q (Ubiquinone).


Why other options are incorrect:

  • Cytochromes a, b, and c are located further downstream in the electron transport chain and receive electrons only after they have passed through Coenzyme Q.

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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