Why is the sun getting smaller and smaller each year

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.

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.

The united states uses which source of energy to produce almost 40 percent of its electricity