Biology Bioenergetics NUMS 2023
PMDC Verified Question 37 of 67
Synthesis of ATP during photosynthesis takes place at the region:
A
Stroma
B
Thylakoid
C
Matrix
D
Cisternae
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Thylakoid
Concept:

ATP synthesis requires an intact membrane to hold a proton gradient (chemiosmosis).

Solution:

  • In chloroplasts, protons are pumped into the lumen of the thylakoid.
  • ATP synthase enzymes are physically embedded in the thylakoid membrane.
  • As protons flow back out into the stroma, ATP is synthesized right at the membrane surface.


Why other options are incorrect:

  • Stroma: where ATP is consumed during the Calvin cycle, not where it is synthesized.
  • Matrix: found in mitochondria, not chloroplasts.

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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