1.
diseases and disorders are being treated by replacing or adding genes to a person’s genome in an experimental procedure called

gene therapy

proteomics

genetic screening

dna microarrays
2.
most restriction enzymes used in genetic research come from

mice

bacteria

viruses

yeast

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.