The endoplasmic reticulum appears rough when _________ are attached to it.
A
Lysosomes
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B
Nucleolus
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C
Centrosomes
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D
Ribosomes
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Solution
The correct option is D Ribosomes There are two types of ER– rough endoplasmic reticulum (RER) and smooth endoplasmic reticulum (SER). RER looks rough under a microscope because it has ribosomes attached to its surface.