Differentiate between Rough endoplasmic reticulum (RER) and smooth endoplasmic reticulum (SER)

Explanation

`{:("S.NO.", " PER "," SER "),(1.,"It is lined with 80S ribosomes and is rough in appearance "," It contains no ribosomes and hence is smooth in appearance "),(2.,"It is site of protein synthesis "," It is the site of lipid and steroid synthesis, and associated with Golgi apparatus "),(3.,"It is formed of cisternae, vesicles and few tubules "," It is mainly formed of vesicles and tubules "),(4.,"It may develop from nuclear envelope "," It may develop from RER "):}`