New membrane synthesis in a eukaryotic cell takes place mainly in the endoplasmic reticulum.
Membranes and their essential proteins are assembled in the ER. This organelle contains the enzymes involved in lipid synthesis, they are inserted into the organelle's very own membranes. This lipid synthesis takes place in part because the lipids are hydrophobic in nature and don't dissolve into the cytoplasm.
Smooth endoplasmic reticulum helps in many metabolic processes. It synthesizes lipids, phospholipids as in plasma membranes, and steroids. Cells that secrete these products, such as cells of the te.stes, ovaries, and skin oil glands, contain excess of smooth endoplasmic reticulum.
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