Biology Homeostasis PMDC Conceptual Practice
PMDC Verified Question 44 of 99
The principal nitrogenous excretory product eliminated in human urine is:
A
Ammonia
B
Uric acid
C
Urea
D
Creatinine
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Urea
Concept: Ureotelism in humans.

Solution: Humans are ureotelic organisms. Ammonia produced by hepatic deamination is converted via the urea cycle into urea, which constitutes over 80–90% of total excreted nitrogenous waste.

Why other options are incorrect:
  • Option A (Ammonia): Too toxic to circulate in high amounts; converted rapidly to urea.

  • Option B (Uric acid): Represents a minor waste product derived from purine catabolism in humans.

  • Option D (Creatinine): A minor waste product derived from skeletal muscle creatine breakdown.

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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