Biology Bioenergetics NUMS 2023
PMDC Verified Question 38 of 67
Which of the following molecules are released after completion of light reaction and the utilized in the dark reaction of photosynthesis?
A
ATP and \( NADP^+ \)
B
ADP and \( NADP^+ \)
C
ADP and NADPM
D
ATP and NADPH
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: ATP and NADPH
Concept:

There is a strict biochemical link between the light-dependent thylakoid reactions and the light-independent stroma reactions.

Solution:

  • The light reactions generate energy-rich molecules.
  • Specifically, ATP provides the chemical energy, and NADPH provides the reducing power (high-energy electrons).
  • Both of these are released into the stroma where they are immediately utilized by the Calvin cycle (dark reaction) to fix \( CO_2 \) into sugars.


Why other options are incorrect:

  • \( ADP \) and \( NADP^+ \) are the depleted, low-energy forms that return to the light reactions to be recharged.

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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