A vesicle carries a protein to the cell membrane, where it is inserted into the phospholipid bilayer.The vesicle budded off from which subcellular structure before making the trip through the cytoplasm to the cell membrane?
A) cis-Golgi
B) Rough ER
C) medial-Golgi
D) Smooth ER
E) trans-Golgi

Question

Quizplus · Accepted Answer

The trans-Golgi is responsible for packaging and sorting proteins, including those destined to be secreted or inserted into the cell membrane. Therefore, the vesicle carrying the protein likely budded off from the trans-Golgi before making its way to the cell membrane. The cis-Golgi is responsible for receiving proteins from the endoplasmic reticulum (ER), the rough ER is responsible for protein synthesis and folding, and the smooth ER is responsible for lipid synthesis and detoxification. While these structures may be involved in the overall process of protein sorting and transport, they are not the most likely starting point for the vesicle carrying the protein to the cell membrane. The medial-Golgi is situated between the cis- and trans-Golgi, and is involved in sorting and modifying proteins further, but again, the vesicle would have likely budded off from the trans-Golgi before reaching this point.

A Vesicle Carries a Protein to the Cell Membrane, Where