Which Form of Endoplasmic Reticulum Modifies and Packages Newly Synthesized

Question

Which form of endoplasmic reticulum modifies and packages newly synthesized proteins?
A) all forms of endoplasmic reticulum
B) simple endoplasmic reticulum
C) raised endoplasmic reticulum
D) smooth endoplasmic reticulum
E) rough endoplasmic reticulum

Accepted Answer

The rough endoplasmic reticulum (RER) has ribosomes attached to its surface, making it studded with small bumps (hence the "rough" description). These ribosomes produce proteins that are channeled into the interior of the RER, where they can be modified and folded into their functional form. The RER then packages the proteins into vesicles that can transport them to other parts of the cell or outside of the cell.