Apentix/AP Biology/Unit 2: Cell Structure and Function/Question
AP Biologyeasymcq1 pt

Pancreatic acinar cells manufacture and export large quantities of digestive enzymes every day. Which organelle appears in unusual abundance in electron micrographs of these cells?

A.Rough endoplasmic reticulum, studded with ribosomes synthesizing the exported proteins
B.Smooth endoplasmic reticulum, which assembles peptide hormones directly
C.Central vacuoles that squeeze enzymes outward under pressure
D.Free cytosolic ribosomes translating enzymes straight into the bloodstream

Explanation

Core Concept

Secreted digestive enzymes follow the classic export route that begins with translation on rough ER ribosomes, continues through Golgi processing, and ends in secretory vesicles. Cells built for heavy secretion accordingly pack extensive rough ER sheets. Steroid producing cells expand smooth ER instead, showing how membrane abundance tracks the product being made.

Correct Answer

ARough endoplasmic reticulum, studded with ribosomes synthesizing the exported proteins

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