A population of field mice displays coat color varying from light to dark. A group of researchers reports that they have identified several mutations
in a gene that seem to be responsible for the color differences. Over time,
how might natural selection result in differential reproductive success of
members of the mice population? *

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.