Which of the following is a form of point-source pollution? a. oil leaks from automobiles c. pesticide runoff b. gasoline leaks from power boats d. sludge dumping select the best answer from the choices provided a b c d

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.