HORTICULTURE

Detailed explanation-1: -Cell membranes serve as barriers and gatekeepers. They are semi-permeable, which means that some molecules can diffuse across the lipid bilayer but others cannot.

Detailed explanation-2: -Protein machineries embedded in the membranes of our cells act as ‘gatekeepers’ controlling everything transported in and out of every cell in our bodies. Because these machineries, called membrane embedded proteins, are vital to the way our bodies function they are the target of at least 40% of drugs.

Detailed explanation-3: -Cell membrane The cell membrane encloses the cell. It acts like a gatekeeper-allowing some materials to pass through it, but not others.

Detailed explanation-4: -A membrane which allows certain substances to pass through it, but not others is called a selectively permeable membrane.

Detailed explanation-5: -The cell membrane can be described as a gatekeeper as its structure determines which materials are allowed to pass in and out of the cell. The cell membrane is described as semipermeable as it allows certain substances to pass through while preventing passage of other materials.