Biology Digestion/Nutrition MDCAT 2014
PMDC Verified Question 48 of 48
In human, Escherichia coli is involved in the formation of:
A
Calcium
B
Vitamin A
C
Vitamin D
D
Vitamin K
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Vitamin K
Concept:

The human large intestine hosts a massive microbiome of symbiotic bacteria that assist in physiological processes.

Formula:

N/A

Solution:

  • Escherichia coli (E. coli) and other commensal bacteria reside in the colon.
  • They ferment undigested carbohydrates and, importantly, synthesize certain essential vitamins that humans cannot produce on their own.
  • The most critical of these microbially synthesized compounds is Vitamin K, which is vital for blood coagulation processes.


Why other options are incorrect:

Calcium is a mineral absorbed from diet. Vitamin D is synthesized in the skin under UV light or obtained via diet. Vitamin A is derived from dietary carotenes. E. coli does not synthesize these.

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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