LIFE SCIENCE

Detailed explanation-1: -Because the interior of the phospholipid bilayer is occupied by hydrophobic fatty acid chains, the membrane is impermeable to water-soluble molecules, including ions and most biological molecules.

Detailed explanation-2: -When cellular membranes form, phospholipids assemble into two layers because of these hydrophilic and hydrophobic properties. The phosphate heads in each layer face the aqueous or watery environment on either side, and the tails hide away from the water between the layers of heads, because they are hydrophobic.

Detailed explanation-3: -The cell membrane, also called the plasma membrane, is found in all cells and separates the interior of the cell from the outside environment. The cell membrane consists of a lipid bilayer that is semipermeable. The cell membrane regulates the transport of materials entering and exiting the cell.

Detailed explanation-4: -Even though the bilayer is only a few nanometres thick, it is impermeable to most water-soluble (polar) molecules. Thus, ions, proteins, sugars, and other large molecules are kept in place on each side of the bilayer and prevented from moving to the other side.