Biology Chemical Coordination ETEA 2019
PMDC Verified Question 44 of 50
The deficiency of which micro-nutrient causes goiter formation?
A
Iron
B
Zinc
C
Iodine
D
Sodium
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Iodine
Concept:

The thyroid gland relies heavily on specific trace minerals to construct its active hormones.

Solution:

  • Thyroxine (\(T_4\)) and Triiodothyronine (\(T_3\)) absolutely require iodine molecules to be synthesized.


  • Without sufficient dietary iodine, \(T_3\) and \(T_4\) levels fall, removing negative feedback on the pituitary. The pituitary furiously pumps out TSH, which overstimulates the thyroid gland, causing it to swell immensely into a condition known as a goiter.


Why other options are incorrect:

Iron deficiency causes anemia. Zinc is important for immunity, and sodium is for nerve impulses.

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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