Biology Bioenergetics DUHS 2022
PMDC Verified Question 61 of 67
The enzyme which is used in Calvin cycle is:
A
Oxidase
B
Reductase
C
Isomerase
D
Rubisco
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Rubisco
Concept:

Carbon fixation requires an incredibly specific enzyme to attach inorganic \( CO_2 \) to an organic 5-carbon molecule.

Solution:

  • The critical enzyme that performs this initial carbon fixation is Ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO).
  • It is considered the most abundant protein on the planet.


Why other options are incorrect:

  • While reductases and isomerases are general classes of enzymes used throughout metabolism, RuBisCO is the defining, specific enzyme of the Calvin cycle.

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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