What evidence suggests that proteins are synthesized and modified in the rough ER as opposed to the smooth ER?
A) ribosomes are associated with the surface of the rough ER.
B) ribosomes are associated with the surface of the smooth ER.
C) proteins can be found in the membrane of the rough ER but not the smooth ER.
D) the smooth ER functions in the synthesis of phospholipids.
E) smooth ER is continuous with rough ER.

Question

Quizplus · Accepted Answer

Since ribosomes are associated with protein synthesis and the rough ER is studded with ribosomes, this suggests a link between these. The surface of the smooth ER is not studded with ribosomes. The other statements are true but are not evidence to support the role of the rough ER in protein synthesis and modification.

What Evidence Suggests That Proteins Are Synthesized and Modified in the Rough