Biology Biomolecules SZABMU 2023
PMDC Verified Question 37 of 142
Second most abundant bio element in human body is:
A
Nitrogen
B
Hydrogen
C
Oxygen
D
Carbon
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Carbon
Concept:

Understanding the mass percentage composition of the six major biological elements (CHNOPS) is foundational.

Solution:

  • The total mass of the human body is dominated primarily by just a few key elements:


  • 1. Oxygen: ~65% (Most abundant, primarily due to massive water content).


  • 2. Carbon: ~18% (The second most abundant, serving as the central backbone for all organic macromolecules).


  • 3. Hydrogen: ~10%.


  • 4. Nitrogen: ~3%.


Why other options are incorrect:

  • Oxygen is #1. Hydrogen is #3. Nitrogen is #4. The question specifically asks for the second most abundant.

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 Biomolecules 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