Biology Bioenergetics SZABMU 2023
PMDC Verified Question 34 of 67
The only copper containing protein involved during light reactions of photosynthesis is:
A
Plastoquinone
B
Cytochrome
C
Ferredoxin
D
Plastocyanin
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Plastocyanin
Concept:

The electron transport chain connecting Photosystem II to Photosystem I relies on specific metalloproteins to pass electrons.

Solution:

  • Plastocyanin is a small, water-soluble, blue-colored protein found in the thylakoid lumen.
  • Its ability to carry electrons is strictly dependent on a single copper atom at its active site, which cycles between \( Cu^{2+} \) and \( Cu^+ \).


Why other options are incorrect:

  • Plastoquinone: is a lipid-soluble quinone, not a metalloprotein.
  • Cytochrome: contains iron (heme).
  • Ferredoxin: contains iron-sulfur clusters.

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.

Previous Question All Bioenergetics MCQs Next Question

Want to solve full-length papers under timed exam conditions?

Practice with zero-scroll lockdown sprints, dynamic latency zone timers, live peer selection telemetry, and the automated Amber mistake recovery loop.

Enter Arena Sprint iOS App Android App