Chemistry Macromolecules / Biochemistry SZABMU 2023
PMDC Verified Question 13 of 47
The two functional groups present in all amino acids are:
A
Carboxylic acid and amino
B
Amino and aldehyde
C
Ether and carboxylic acid
D
Aldehyde and carboxylic acid
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Carboxylic acid and amino
Concept:

An \( \alpha \)-amino acid has a specific, highly conserved core structure surrounding a central chiral carbon atom.

Formula:

$$ \text{H}_2\text{N-CH(R)-COOH} $$

Solution:

  • Every amino acid has a central \( \alpha \)-carbon bonded to a hydrogen atom and an R-group side chain.
  • Crucially, it is bonded to a basic amino group (\( \text{-NH}_2 \)) and an acidic carboxyl group (\( \text{-COOH} \)).
  • Hence, the two defining functional groups are carboxylic acid and amino groups.


Why other options are incorrect:

Aldehydes and ethers are not part of the standard amino acid backbone. While some specific R-groups might contain complex functionalities, only the amino and carboxyl groups are universally present in all 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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