Biology Biomolecules MDCAT 2019
PMDC Verified Question 116 of 142
Most proteins are made up of:
A
20 types of amino acids
B
170 types of amino acids
C
16 types of amino acids
D
10 types of amino acids
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 types of amino acids
Concept:

The universal genetic code translates RNA into a very specific subset of biological monomers.

Solution:

  • While about 170 amino acids exist in nature, only about 25 are used as constituents in biological proteins.


  • Of those 25, exactly 20 standard types of amino acids are directly encoded by the universal genetic code (DNA/RNA) and make up the overwhelming majority of nearly all cellular proteins across all domains of life.


Why other options are incorrect:

  • 170 represents the total found anywhere in tissues, not those used to build proteins. The numbers 16 and 10 have no biochemical significance here.

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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