Question

why is rough endoplasmic reticulum called rough?​

Answer 1

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The rough endoplasmic reticulum (RER) is so named for the appearance of its outer surface, which is studded with protein-synthesizing particles known as ribosomes.

Answer 2

Answer:

Rough ER is named for its rough appearance, which is due to the ribosomes attached to its outer (cytoplasmic) surface.

Explanation:

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