Mucin Synthesis and Release in Goblet Cells

Steps:

• Mucin glycoproteins are synthesized in the rough endoplasmic reticulum (RER) of goblet cells.
• They undergo glycosylation and packaging in the Golgi apparatus into secretory granules.
• Release occurs via exocytosis, stimulated by neural or chemical signals.
• Statement 2 is incorrect, as mucin is not synthesized in the smooth ER.

Why B is correct:

• B selects statements 1 and 3, matching the accurate processes of RER synthesis and exocytosis release per cell biology definitions.

Why the others are wrong:

• A includes incorrect statement 2 on synthesis site.
• C omits correct statement 3 on release mechanism.
• D includes incorrect statement 2.

Not enough information on exact statements 1-3.

Final answer: B