Biology Biomolecules NUMS 2023
PMDC Verified Question 54 of 142
Most abundant organic compound in mammalian cells are:
A
Lipids
B
Water
C
Proteins
D
Carbohydrates
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Proteins
Concept:

It is crucial to distinguish between total compounds and organic compounds in cellular composition.

Solution:

  • While Water is universally the most abundant compound overall (70%), it is strictly an inorganic molecule.


  • The question explicitly asks for the most abundant organic compound (carbon-based macromolecules).


  • Proteins make up roughly 18% of the total cellular mass (over half of the dry weight of a cell), making them the most abundant organic compounds in any mammalian cell by a massive margin.


Why other options are incorrect:

  • Water: Inorganic.


  • Lipids (~3%) & Carbohydrates (~4%): These represent significantly smaller mass fractions compared to the ubiquitous presence of structural and enzymatic proteins.

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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