We know that hormones play critical roles in female ovulation and the cycle of menstruation. hormones are also critical to spermatogenesis in males. what hormone(s) is/are responsible for sperm production? a) testosterone b) estrogen and testosterone c) testosterone and follicle stimulating hormone d) progesterone and follicle stimulating hormone

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.