The rough ER is the portion of the ER that
A) lacks ribosomes.
B) is the oldest and was once the smooth ER.
C) has ribosomes attached to it.
D) is connected to the Golgi apparatus.
E) is the site of steroid synthesis.

Question

Quizplus · Accepted Answer

The rough endoplasmic reticulum (ER) has ribosomes attached to it, which give it a "rough" appearance under a microscope. These ribosomes are responsible for translating mRNA into proteins that are then transported through the rough ER for further modification and processing.

The Rough ER Is the Portion of the ER That