Chemistry Macromolecules / Biochemistry DUHS 2023
PMDC Verified Question 18 of 47
Which of the following is an Amino acid?
A
Palmitic acid
B
Aspartic acid
C
Benzoic acid
D
Aniline
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Aspartic acid
Concept:

Amino acids have a central carbon bonded to an amino group, a carboxyl group, a hydrogen atom, and a distinct R-group side chain.

Formula:

$$ \text{HOOC-CH}_2\text{-CH(NH}_2\text{)-COOH} $$

Solution:

  • Among the choices, aspartic acid (aspartate) is one of the standard 20 naturally occurring \( \alpha \)-amino acids used to synthesize proteins.
  • Its R-group is a \( \text{-CH}_2\text{-COOH} \) group, making it an acidic amino acid.


Why other options are incorrect:

Palmitic acid is a 16-carbon saturated fatty acid. Benzoic acid is an aromatic carboxylic acid. Aniline is an aromatic amine (phenylamine). None of these possess the dual amino-carboxyl backbone of an amino acid.

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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