Biology Bioenergetics BUMHS 2022
PMDC Verified Question 50 of 67
What is the number of hydrogen atoms in the molecular formula of chlorophyll 'a'?
A
Six
B
Fifty five
C
Seventy
D
Seventy two
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Seventy two
Concept:

Chlorophyll a is the primary photosynthetic pigment with a specific complex chemical formula.

Formula:

$$ C_{55}H_{72}O_{5}N_{4}Mg $$

Solution:

  • Based on the molecular formula, chlorophyll a contains exactly 72 hydrogen atoms.


Why other options are incorrect:

  • 55 is the number of Carbon atoms.
  • 70 is the number of hydrogen atoms in chlorophyll b (\( C_{55}H_{70}O_{6}N_{4}Mg \)).

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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