SER and RER can be distinguished with its presence in Protein synthesising cells, Fat and protein synthesising cells, Protein and lipid synthesising cells, Carbohydrates and fat synthesising cells

The correct option is D Fat and protein synthesising cells. The endoplasmic reticulum is a network of membranous sacs like structure, such as cisterns, vesicles, and narrow tubules. On the basis of presence or absence of ribosomes on its surface, these are two types-Rough endoplasmic reticulum (RER) with ribosomes on its surface prominently sites where the protein is synthesizing. Smooth endoplasmic reticulum (SER) lack ribosomes and the sites for synthesis of cholesterol and lipids. Thus the correct answer is option D.