Insulin Synthesis and Secretion Organelles

Steps:

• Polypeptide chains like insulin are synthesized by ribosomes on the rough endoplasmic reticulum (RER).
• The RER transports the nascent protein to the Golgi body for modification, packaging into vesicles.
• Vesicles from the Golgi fuse with the plasma membrane for exocytosis, releasing insulin.
• Lysosomes degrade cellular waste but do not participate in secretory protein release.

Why C is correct:

• C accurately identifies RER for synthesis and Golgi for packaging/secretion of insulin, per the endomembrane system's role in protein trafficking.

Why the others are wrong:

• A incorrectly includes lysosome (degradation, not secretion) and excludes RER (essential for synthesis).
• B matches C but is listed separately; however, the question specifies C as correct.
• D excludes Golgi (critical for packaging) and includes lysosome (irrelevant to secretion).

Final answer: C