A newly synthesized protein destined to be secreted outside the cell as an enzyme must travel through the cellular postal system. Select the correct, sequential pathway this protein takes from its origin to its final export.

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A Golgi apparatus → Rough Endoplasmic Reticulum → Lysosome → Plasma membrane
B Rough Endoplasmic Reticulum → Golgi apparatus → Secretory vesicle → Plasma membrane
C Smooth Endoplasmic Reticulum → Ribosome → Nucleus→ Cell wall
D Nucleoplasm→ Mitochondria→ Vacuole → Exocytosis

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Answer: B. Rough Endoplasmic Reticulum → Golgi apparatus → Secretory vesicle → Plasma membrane

Answer: B) Rough Endoplasmic Reticulum → Golgi apparatus → Secretory vesicle → Plasma membrane
Explanation: Proteins are synthesized by ribosomes sitting on the Rough Endoplasmic Reticulum (RER). They are then packed into transport vesicles and sent to the Golgi apparatus, which modifies, sorts, and packages them into secretory vesicles. These vesicles travel to and fuse with the plasma membrane to release the proteins outside the cell.

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A newly synthesized protein destined to be secreted outside the cell as an enzyme must travel through the cellular postal system. Select the correct, sequential pathway this protein takes from its origin to its final export.

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