Why do sperm cells need many mitochondria? choose one answer. a: sperm cells are involved in fertilization b: sperm cells are produced in very large numbers c: sperm cells need a lot of energy to swim

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.