Chemistry Carboxylic Acids DUHS 2024
PMDC Verified Question 15 of 94
Total number of alpha amino acids are:
A
20
B
22
C
27
D
25
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: 20
Concept:

While hundreds of amino acids exist in nature, only a specific subset is coded directly by the universal genetic code to build proteins.

Solution:

  • In standard biochemistry taught at this level, there are exactly 20 standard alpha-amino acids that make up human proteins (proteinogenic amino acids).


Why other options are incorrect:

While discoveries of selenocysteine (21st) and pyrrolysine (22nd) exist in advanced molecular biology, 20 is the definitive textbook standard for this academic level.

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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