Endoplasmic reticulum is a network of interconnecting membranous …

MCQ

Endoplasmic reticulum is a network of interconnecting membranous structures filled with fluid. Which of the following cells would most likely have high concentration of densely packed rough endoplasmic reticulum?

A
A bioluminescent bacterial cell.
B
A functional phloem at maturity.
C
An amoeba engulfing small ciliates.
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A pancreatic cell engaged in the production of digestive enzymes.

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Answer

Correct option: D.

A pancreatic cell engaged in the production of digestive enzymes.

Endoplasmic reticulum helps in the transport of substances within the cell. Rough endoplasmic reticulum $(\text{RER})$ bears ribosomes on the cytoplasmic surface and synthesize secretory and membranous proteins. Then the modified proteins move into the transitional area where they are further processed and packed into secretory vesicles. Thus, $\text{RER}$ is rich in cells which are actively engaged in protein synthesis and secretory activity, e.g., pancreatic cells engaged in the production of digestive enzymes, etc.