Biology Bioenergetics DUHS 2022
PMDC Verified Question 56 of 67
Light reaction of photosynthesis takes place in:
A
Cristae
B
Stroma
C
Cisternae
D
Thylakoid
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Thylakoid
Concept:

The light-dependent reactions require a membrane to embed photosystems and establish a proton gradient.

Solution:

  • Photosystems (groups of pigment molecules) and the electron transport chain are physically embedded in the thylakoid membrane.
  • Consequently, all light-driven reactions, including photolysis of water and ATP synthesis, take place on or across the thylakoid.


Why other options are incorrect:

  • Stroma: The fluid where light-independent reactions (Calvin cycle) occur.
  • Cristae: The folds of the inner mitochondrial membrane (cellular respiration).
  • Cisternae: Flattened sacs in the Golgi apparatus or ER.

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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