Which statement best explains how organ systems in the human body function A. They work at different times to conserve energy
B. They work together to benefit the entire organism
C. They work at different times, depending on their job
D. They work independently of each other, for efficiency

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.