Although there are over 100 elements in the universe, organic matter usually contains a limited number of these elements and always includes the element
a) carbon.
b) nitrogen.
c) oxygen.
d) water.

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.

What does spontaneous generation mean?

The assembly called for a "bill of rights" that would list u.s. citizens'