It is important that certain free ribosomes bind tothe outer surface of the endoplasmic reticulum (ER)in order to complete their protein synthesis because

Options

A. ER membrane will break down without the
presence of numerous ribosomes.
B. it allows the synthesis of certain proteins to be completed in the cytosol.
C. it prevents the possibility that the synthesis
of certain proteins, such as lysosomal
hydrolases, would go to completion in the
cytoplasm.
D. mitochondrial ribosomes must transcribe proteins encoded for by mitochondrial DNA in this manner.