What Types of Proteins are Not Synthesized in the Rough

Question

What types of proteins are not synthesized in the rough ER?
A) endoplasmic reticulum proteins
B) extracellular matrix proteins
C) secreted proteins
D) mitochondrial proteins
E) plasma membrane proteins

Accepted Answer

Mitochondrial proteins are not synthesized in the rough ER. They are synthesized in the cytoplasm and then transported into the mitochondria.

Answer: B and E 
 Extracellular matrix proteins and plasma membrane proteins are not synthesized in the rough ER. They are synthesized in other locations such as the Golgi apparatus and transported to the extracellular matrix or plasma membrane.