Question

The selectively permeable membrane of the cell is

• A. Plasmalemma
• B. Cytoplasm
• C. Cell wall
• D. All of the above

Answer 1

The correct option is A Plasmalemma

Plasma membrane (also known as plasmalemma) is selectively permeable which allows the movement of certain substances into and out of the cell. It is made of two layers of proteins and phospholipids. It allows proteins and lipid soluble protein to pass through it by means of active and passive transport.

The proteins of the plasma membrane are of two types intrinsic and extrinsic. The extrinsic proteins are loosely attached to the surface of plasma membrane. Intrinsic proteins are attached deeply inside the membrane which acts as a channel protein and helps in the influx of cellular ions and molecules during active transport. Phospholipids are the lipids which have a hydrophobic tail which does not interact with water and a hydrophilic head which can interact with water.

So, the correct answer is option A.