Biology Biomolecules ETEA 2022
PMDC Verified Question 95 of 142
A haemoglobin molecule consists of ____ amino acids.
A
874
B
474
C
674
D
574
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: 574
Concept:

Hemoglobin structure is a classic textbook example of quaternary protein assembly.

Solution:

  • A standard human Hemoglobin A molecule is a tetramer, consisting of exactly four polypeptide chains:


  • Two alpha (\(\alpha\)) chains, each containing exactly 141 amino acids (Total = 282).


  • Two beta (\(\beta\)) chains, each containing exactly 146 amino acids (Total = 292).


  • Summing them up: \( 282 + 292 = \) 574 total amino acids.


Why other options are incorrect:

  • The numbers 474, 674, and 874 do not correlate with the highly conserved genetic sequence encoding mammalian hemoglobin chains.

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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