Biology Biomolecules ETEA 2022
PMDC Verified Question 93 of 142
Haemoglobin is a:
A
Carbohydrate
B
Protein
C
Nucleic acid
D
Enzyme
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Protein
Concept:

Hemoglobin is the primary oxygen-transporting molecule in the blood of vertebrates.

Solution:

  • Haemoglobin is a complex, conjugated globular protein.


  • It consists of four distinct polypeptide chains (two alpha and two beta chains), heavily folded into a Quaternary structure around non-protein heme groups that bind oxygen.


Why other options are incorrect:

  • Enzyme: Although it is a protein, hemoglobin does not catalyze chemical reactions; it passively binds and transports gas, so it is a transport protein, not an enzyme.


  • Carbohydrate / Nucleic acid: Completely different macromolecule classes.

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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