Why are identical twins ideal
for studying the impact of the
environment on phenotypes?

The influenza virus cause the flu, but not other diseases. why?

Loss of protected health information collected for research should be directly reported to:

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.