Biology Bioenergetics ETEA 2022
PMDC Verified Question 60 of 67
The Calvin cycle is completed in _ stages.
A
Two
B
Three
C
Four
D
Five
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Three
Concept:

The Calvin cycle is conventionally divided into distinct functional phases.

Solution:

  • The cycle occurs in three primary stages:
  • Stage 1: Carbon Fixation (attaching \( CO_2 \) to RuBP).
  • Stage 2: Reduction (using ATP and NADPH to convert 3-PGA to G3P).
  • Stage 3: Regeneration (re-arranging G3P to regenerate the starting RuBP molecule).


Why other options are incorrect:

  • Dividing the cycle into any other number of core phases does not align with standard biochemical consensus.

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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