Receptor editing of immature lymphocytes occurs in generative lymphoid organs true

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.

Why does sexual reproduction result in more genetic variation in a species

Strands of genetic material floating in the nucleus are referred to as