Biology Bioenergetics NUMS 2022
PMDC Verified Question 48 of 67
Magnesium is an important nutrient in plant for the formation of:
A
Proteins
B
Lipids
C
Chlorophyll
D
Enzymes
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Chlorophyll
Concept:

Chlorophyll is a complex organic molecule built around a central metallic ion.

Solution:

  • The core of the chlorophyll molecule consists of a porphyrin ring.
  • Magnesium (\( Mg^{2+} \)) is located exactly in the center of this porphyrin ring.
  • Without magnesium, the plant cannot synthesize chlorophyll, leading to chlorosis (yellowing of leaves).


Why other options are incorrect:

  • Proteins and enzymes primarily rely on nitrogen and sulfur.
  • Lipids are primarily composed of carbon, hydrogen, and oxygen.

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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