Biology Bioenergetics SZABMU 2023
PMDC Verified Question 32 of 67
The final acceptor of both electrons and protons during light reactions of photosynthesis is:
A
PQ
B
PC
C
Fd
D
\( NADP^+ \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: \( NADP^+ \)
Concept:

Non-cyclic electron flow (the Z-scheme) in photosynthesis moves electrons from water ultimately to a carrier molecule that will be used in the dark reactions.

Solution:

  • Electrons travel from PSII, through the ETC, to PSI, and finally to the enzyme NADP reductase.
  • Here, \( NADP^+ \) serves as the terminal electron acceptor.
  • It simultaneously picks up protons (\( H^+ \)) from the stroma to form NADPH, taking both to the Calvin cycle.


Why other options are incorrect:

  • Plastoquinone (PQ), Plastocyanin (PC), and Ferredoxin (Fd) are intermediate carriers that simply pass electrons along, rather than holding them at the end of the chain.

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