The graph below shows the electronegativities of the elements in the periodic table. mc020-1.jpg which would least strongly attract electrons from other atoms in a compound? elements of group 1 elements of group 2 elements of group 15 elements of group 17

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.