EVERYDAY SCIENCE

Detailed explanation-1: -Biological membranes consist of a continuous double layer of lipid molecules in which membrane proteins are embedded. This lipid bilayer is fluid, with individual lipid molecules able to diffuse rapidly within their own monolayer.

Detailed explanation-2: -Answer and Explanation: The phospholipid bilayer part of the cell membrane is the part of the cell membrane which acts like a fluid.

Detailed explanation-3: -Lipids are molecules that are composed of a hydrophilic head group and a hydrophobic tail.

Detailed explanation-4: -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-5: -Hence, the correct answer is ‘The non-polar or hydrophobic hydrocarbons tails of lipid, being on inner side ensure their protection from the aqueous environment.