Chemistry Carboxylic Acids UHS 2024
PMDC Verified Question 2 of 94
Which of the following is not an amino acid?
A
Folic acid
B
Glycine
C
Glutamic acid
D
Lysine
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Folic acid
Concept:

Alpha-amino acids are the building blocks of proteins, characterized by having an amino group (\( -\text{NH}_2 \)) and a carboxyl group (\( -\text{COOH} \)) attached to the same alpha-carbon.

Solution:

  • Glycine, Glutamic acid, and Lysine are all standard, proteinogenic \( \alpha \)-amino acids.


  • Folic acid (Vitamin B9) is a complex water-soluble vitamin consisting of a pteridine ring, p-aminobenzoic acid, and glutamic acid moieties. While it contains an amino acid moiety, the molecule as a whole is classified as a vitamin, not a fundamental monomeric amino acid.


Why other options are incorrect:

Glycine, Glutamic acid, and Lysine perfectly fit the strict biochemical definition of alpha-amino acids.

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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