Membrane proteins are synthesized on ribosomes that are located
A) in the cytoplasm.
B) on the rough endoplasmic reticulum.
C) on the smooth endoplasmic reticulum.
D) on the Golgi apparatus.
E) in the nucleus.

Question

Quizplus · Accepted Answer

Membrane proteins are synthesized on ribosomes that are bound to the rough endoplasmic reticulum (RER), distinguishing them from those synthesized in the cytoplasm, which typically stay within the cell or are released into the cytoplasm. The RER has ribosomes on its surface, giving it a "rough" appearance, and is involved in the synthesis of proteins that are destined for the cell membrane, secretion, or for use in lysosomes.

Membrane Proteins Are Synthesized on Ribosomes That Are Located