Biology Biomolecules NUMS 2019
PMDC Verified Question 120 of 142
The structure given below is the constituent part of:

$$ \text{H}_2\text{N} - \underset{\text{H}}{\overset{\text{R}}{\text{C}}} - \text{COOH} $$
A
Proteins
B
Lipids
C
Vitamins
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 A: Proteins
Concept:

Identifying biological monomers from structural formulas.

Solution:

  • The given formula vividly depicts a central alpha-carbon atom bonded to an amino group (-NH2), a carboxyl acidic group (-COOH), a variable side chain (-R), and a hydrogen atom.


  • This is the universal, defining backbone structure of an amino acid.


  • Amino acids strictly polymerize to form Proteins.


Why other options are incorrect:

  • Lipids: Comprised of fatty acids and glycerol.


  • Carbohydrates: Comprised of polyhydroxy aldehydes/ketones (monosaccharides).


  • Vitamins: Highly varied small organic co-factors, lacking this specific uniform backbone.

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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