True or false : During a chemical change, the form of a substance is altered, but not its identity.

What element is able to combine with itself and hydrogen to form large molecules ?

What terms describes being out of water after being submerged

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.