<prompt> Endoplasmic reticulum is not involved in ?Protein synthesisSteroid synthesisDNA synthesisTriglyceride synthesis  <response>: Ans. is c i.e., DNA synthesis Endoplasmic reticulum are involved in :-Rough ER : Protein synthesis hormones, enzymes etc.Smooth ER: Triglyceride synthesis, steroid synthesis, cholesterol synthesis, Phospholipid synthesis, fatty acid chain elongation. 