PLEASE HELP ME PLEASE HELP ME PLEASE HELP ME Why are proteins important?

A All the above

B Some fight disease and illness

C They are involved in nearly every cellular process

D Some function as enzymes

Lactase is essential for digesting lactose in milk. this enzyme is specific for this sugar. why? molecules and active sites vary in size; only properly sized molecules can fit.there is a precise compatibility between the active site and the lactose molecule.specificity refers to the action of the enzyme, such as hydrolysis, and relatively few molecules can be hydrolyzed.reaction-specific enzymes assume a fit by folding around the most numerous substrate molecules.