Rough ER is connected to the nuclear membrane and to smooth ER.
Rough Endoplasmic reticulum
It is a membranous organelle that is a part endo-membrane system in the cell. It is connected to the nuclear membrane and arises as flattened projections. These organelles are attached to ribosomes and therefore, called rough.
The rough endoplasmic reticulum has many folds that are connected to smooth endoplasmic reticulum as these lack ribosomes on its surface.
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