Some proteins were shown to be released (by way of vesicles) to the cell exterior. These vesicles were shown coming from which organelle?

Question

BlackTom AI · Accepted Answer

The question asks which organelle is the source of vesicles that carry released proteins to the cell exterior.
Option 1: The nucleus — While the nucleus houses genetic material and coordinates transcription, it is not the source of secretory vesicles containing proteins sent outside the cell. Secretory vesicles originate from the endomembrane system, not the nuclear envelope.
Option 2: The ribosome — Ribosomes synthesize proteins, but they are not themselves vesicles or responsible for packaging proteins into extracellular vesicles. Post-translational processing and packaging involve other organelles after synthesis.
Option 3: The Golgi apparatus — This is the central hub of the secretory pathway. Proteins synthesized in the rough ER are trafficked to the Golgi, where they are processed, sorted, and packaged into vesicles that bud off and travel to the plasma membrane for secretion. This makes the Golgi the correct source of such vesicles.
Option 4: The mitochondrion — Mitochondria generate ATP and are involved in energy production and other metabolic roles, but they do not participate in the packaging of secreted proteins into vesicles destined for extrusion.
In summary, the Golgi apparatus is the organelle responsible for processing and packaging proteins into secretory vesicles that fuse with the plasma membrane to release contents outside the cell, whereas the other organelles do not perform this vesicle-mediated secretion role.

Some proteins were shown to be released (by way of vesicles) to the cell exterior. These vesicles were shown coming from which organelle?单项选择题

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