Biology Cell SZABMU 2024 Reconduct
PMDC Verified Question 1 of 143
Middle lamella is composed of:
A
Magnesium + sodium salts + pectin
B
Magnesium + calcium salts + pectin
C
Calcium + sodium salts + pectin
D
Magnesium + potassium salts + pectin
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Magnesium + calcium salts + pectin
Concept: Plant cells are glued together by a sticky extracellular layer.

Solution: The middle lamella is the first layer formed during cell division, acting as a cement between adjacent plant cells. It is primarily composed of sticky pectates, specifically calcium and magnesium salts of pectic acid (pectin).

Distractor Autopsy: Sodium and potassium are highly soluble monovalent cations and do not form the rigid, insoluble cross-links required for plant cell adhesion.

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.

Want to solve full-length papers under timed exam conditions?

Practice with zero-scroll lockdown sprints, dynamic latency zone timers, live peer selection telemetry, and the automated Amber mistake recovery loop.