What are smooth and rough endoplasmic reticulum?

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Smooth ER aren't covered in ribosomes, but rough ER are. ER are like transport tubes that go through the cell.
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How are smooth and rough endoplasmic reticulum similar?

They are both an interconnected network of tubules, vesicles and cisternae. The general structure of the endoplasmic reticulum is an extensive membrane network of cisternae (s

Why is the endoplasmic reticulum found as rough and smooth?

if ribosomes are found attached to ER (endoplasmic reticulum) it is called rough ER and it is responsible for protein synthesis. but, if no ribosomes are attached to ER it i