Biology Respiration / Gaseous Exchange SZABMU 2024
PMDC Verified Question 4 of 34
Which type of the conjugated molecule is absent in respiratory distress syndrome?
A
Lipoprotein
B
Glycoprotein
C
Lipopolysaccharides
D
Glycolipids
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Lipoprotein
Concept: Surfactant is biochemically essential to prevent the collapse of alveoli by interfering with the hydrogen bonding of water.

Solution:
  • Pulmonary surfactant is synthesized by Type II alveolar cells.
  • Biochemically, it is a highly complex mixture composed predominantly of phospholipids combined with specific proteins—making it a lipoprotein complex.
  • In Respiratory Distress Syndrome (common in premature neonates), the severe lack of this specific lipoprotein causes overwhelming alveolar surface tension, leading to lung collapse.


Why other options are incorrect:
  • Glycoprotein / Glycolipids: Common components of cell membrane receptors, but not the primary functional surfactant molecule.
  • Lipopolysaccharides: Found in the outer membranes of Gram-negative bacteria as endotoxins.

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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