Brainlies asap! 1. which statement is true about elements? they are finite in number. they are infinite in number. they combine to form atoms. they combine to form electrons. 2. which family in the periodic table has metals that are usually harder than other metals? alkali metals alkaline earth metals lanthanide series transition metals

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.