NEET BIOLOGY

Detailed explanation-1: -Membranes and their constituent proteins are assembled in the ER. This organelle contains the enzymes involved in lipid synthesis, and as lipids are manufactured in the ER, they are inserted into the organelle’s own membranes.

Detailed explanation-2: -Smooth ER is devoted almost exclusively to the manufacture of lipids and in some cases to the metabolism of them and associated products.

Detailed explanation-3: -The ER: the main site of lipid synthesis The main lipid biosynthetic organelle is the endoplasmic reticulum (ER )16, which produces the bulk of the structural phospholipids and cholesterol (ergosterol in yeast) (FIG.

Detailed explanation-4: -The ER has a central role in lipid and protein biosynthesis. Its membrane is the site of production of all the transmembrane proteins and lipids for most of the cell’s organelles, including the ER itself, the Golgi apparatus, lysosomes, endosomes, secretory vesicles, and the plasma membrane.

Detailed explanation-5: -The proteins made by the rough endoplasmic reticulum are for use outside of the cell. Functions of the smooth endoplasmic reticulum include synthesis of carbohydrates, lipids, and steroid hormones; detoxification of medications and poisons; and storage of calcium ions.