Which one of the following correctly represents RER?
Endoplasmic reticulum having no ribosomes attached to its surface
Endoplasmic reticulum having ribosomes attached to its surface
Endoplasmic reticulum with rounded vesicles
Endoplasmic reticulum with Golgi appears on its surface
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UPSC Geoscientist – 2020
The endoplasmic reticulum (ER) is a network of membranes throughout the cytoplasm of eukaryotic cells. It exists in two forms: rough ER (RER) and smooth ER (SER). The presence of ribosomes on the outer surface of the membrane distinguishes RER from SER. These ribosomes are involved in the synthesis of proteins, particularly those destined for secretion or insertion into membranes.