Question

Match the properties described with one of the four components of a membrane. Interior protein network Phospholipid bilayer Can span both layers of a membrane Often carbohydrate attached to lipid or protein Helps determine the overall shape of a cell Can form channels to allow small molecules to cross membranes Transmembrane protein Cell surface marker Forms a semipermeable barrier Can allow diffusion of gases Reset

Answer 1

A) Interior protein network

1. Helps determine the overall shape of a cell. ( Network of interlinking proteins inside the cell cytoplasm is known as cytoskeleton and it helps in maintaining cell shape and internal organisation).

B) Phospholipid bilayer

1. Forms a semipermeable membrane. (Cell membrane made up of two layers of phospholipids allows only certain molecules to pass through it.)

2. Can allow of diffusion of gases. ( Cell membrane is permeable to non polar molecules and gases).

C) Transmembrane protein

1. Can span both layers of a membrane. (Transmembrane protein is an integral membrane protein that span both layers of a membrane).

2. Can form channels to allow small molecules to cross membranes. (Transmembrane proteins can act as passage for ions and molecules).

D) Cell surface marker

1. Often carbohydrates attached to lipid or protein. (Carbohydrates attached to lipid or protein act as cell surface marker e.g. A and B antigen present on the surface of red blood cells).