Which of the following correctly shows the sequence of organelles a protein would take if it were being exported from the cell?
The correct sequence of organelles for protein export from the cell is as follows:
1. Endoplasmic Reticulum (ER):
- Proteins destined for the cell membrane or secretion are synthesized by ribosomes bound to the ER membrane.
2. Golgi Apparatus:
- After synthesis, these proteins move to the Golgi apparatus.
- The Golgi apparatus modifies and sorts proteins, preparing them for secretion or transport to other cellular compartments.
3. Vesicles:
- Golgi apparatus packages the modified proteins into vesicles.
4. Plasma Membrane:
- The vesicles fuse with the plasma membrane, releasing the proteins outside the cell by exocytosis.
So, the correct sequence of organelles for protein export is: ER -> Golgi Apparatus -> Vesicles -> Plasma Membrane.
The correct sequence of organelles involved in protein export from the cell is as follows:
1. Endoplasmic reticulum (ER): Proteins being exported from the cell are synthesized by ribosomes attached to the rough endoplasmic reticulum (RER). The RER helps in protein folding, modification, and quality control before further processing.
2. Golgi apparatus: After synthesis in the ER, proteins are transported to the Golgi apparatus. The Golgi modifies, sorts, and packages the proteins into vesicles.
3. Vesicles: The Golgi apparatus packages the proteins into transport vesicles, which bud off and move toward the plasma membrane.
4. Plasma membrane: The transport vesicles fuse with the plasma membrane, and the proteins are released outside the cell through a process called exocytosis.
Therefore, the correct sequence is: Endoplasmic reticulum (ER) -> Golgi apparatus -> Vesicles -> Plasma membrane.