Which of the following correctly states the functions of the rough endoplasmic reticulum ? lipid metabolism, cholesterol synthesis, and synthesis of the lipid components of lipoproteins absorption, synthesis, and transport of fats. storage of calcium ions synthesis of the cell\'s membranes Solution As per the given options rough endoplasmic reticulum functions are :- 2) Absorbtion, synthesis and transport of fats & 4) Synthesis of cell membranes Generally, the eucaryotic cell contains two types of endoplasmic reticulum i) Rough Endoplasmic Reticulum. Rough Endoplasmic Reticulum why named as rough means it contains ribosomes on it so, the surface of the reticulum looks rough. The main function of the rough ER is protein synthesis due to the ribosomes. Rough ER through the membrane contact sites contact with the other organells allowing the transfer of lipids and other small molecules. The intestinal cells, pancreatic cells, which involves in the absorption process contains more rough ER why because the proteins synthesized by the Rough ER involved in the intracellular transport of resynthesized lipids.So the rough ER indirectly helps in the absorption process. ii)Smooth Endoplasmic Reticulum:- Due to the absence of ribosomes it looks smooth so named as smooth ER. The main role is lipid metabolism, and synthesis of carbohydrates and steroid harmones and storage of calcium ions So, in the given question the first option(Lipid metabolism, cholesterol synthesis, synthesis of lipid components of lipo proteins) indicates smooth Endoplasmic Reticulum functions 2nd option Absorbtion, synthesis and transport of fats indicates Rough Endoplasmic Reticulum functions 3rd Option Indicates(Storage of Calcium ions) smooth Endoplasmic Reticulum functions 4th Option is synthesis of cell membrane, For this function the main role of rough Endoplasmic reticulum is during the lipid transport the replenishment of new membranes is done by the morphological change of rough endoplasmic reticulum involved..