Four stars of equal size emit the same amount of energy. the distance of these stars from earth is shown in the table below. distance from earth star distance from earth (light years) p 2.3 q 7.8 r 6.5 s 3.2 what is the order of apparent magnitude of the stars, starting from the least to the greatest? a) q, r, s, p b) p, s, r, q c) r, s, p, q d) q, p, s, r

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.