Which Structure is the Site of the Synthesis of Proteins

Question

Which structure is the site of the synthesis of proteins that may be exported from the cell?
A) rough ER
B) lysosomes
C) plasmodesmata
D) Golgi vesicles
E) free cytoplasmic ribosomes

Accepted Answer

The rough endoplasmic reticulum (ER) contains ribosomes that synthesize proteins that are usually targeted for export out of the cell or are embedded in membranes. The rough ER is involved in protein synthesis, folding, and modification. Therefore, it is the structure that is the site of the synthesis of proteins that may be exported from the cell.