Chemistry Macromolecules / Biochemistry DUHS 2024
PMDC Verified Question 4 of 47
It transports oxygen from the lungs to every tissue of the body
A
Proteins
B
Hemoglobin
C
Hormones
D
Liquids
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Hemoglobin
Concept:

Red blood cells utilize specialized metalloproteins to reversibly bind and transport respiratory gases.

Formula:

$$ \text{Hb} + 4\text{O}_2 \rightleftharpoons \text{Hb(O}_2)_4 $$

Solution:

  • The erythrocytes (red blood cells) are packed with a specialized iron-containing protein called hemoglobin.
  • Hemoglobin binds oxygen tightly in the high-oxygen environment of the lungs and releases it in the lower-oxygen environment of peripheral tissues.


Why other options are incorrect:

While hemoglobin is a protein, "Proteins" is far too broad of an answer. Hormones regulate physiology, and liquids (like blood plasma) carry only a negligible amount of dissolved oxygen compared to hemoglobin.

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.

Previous Question All Macromolecules / Biochemistry MCQs Next Question

Want to solve full-length papers under timed exam conditions?

Practice with zero-scroll lockdown sprints, dynamic latency zone timers, live peer selection telemetry, and the automated Amber mistake recovery loop.

Enter Arena Sprint iOS App Android App