Dna encodes the information necessary to produce the proteins needed by your body. to make these proteins, dna first undergoes a process known as transcription. this is when the information on a dna strand is transferred to a molecule very similar to dna, known as .

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.