Endoplasmic Reticulum are rough because of ____ present on their surface:

Q. Endoplasmic Reticulum are rough because of ____ present on their surface:
Answer: Ribosomes
Notes: There are two regions of endoplasmic reticulum that differ in both structure and function. One region is called rough ER because it has ribosomes attached to the cytoplasmic side of the membrane. The other region is called smooth ER because it lacks attached ribosomes.

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