Biology Bioenergetics UHS 2024
PMDC Verified Question 14 of 67
The PS II during light reactions receives electrons from splitting:
A
Water
B
Plastoquinone
C
Plastocyanin
D
Ferredoxin
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Water
Concept:

When Photosystem II (P680) absorbs light and ejects electrons, it becomes a powerful oxidizing agent that must replace its lost electrons to continue functioning.

Solution:

  • To fill the "electron hole" created in the P680 reaction center, an associated enzyme complex carries out photolysis.
  • Photolysis is the physical splitting of Water (\( H_2O \)) into protons, oxygen, and electrons.
  • These extracted electrons are immediately fed into Photosystem II.


Why other options are incorrect:

  • Plastoquinone, Plastocyanin, and Ferredoxin are all downstream carriers in the electron transport chain; they receive electrons from the photosystems, rather than supplying them to PS II.

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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