An experiment was done to determine if the time it takes to run a kilometer is related to the amount of exercise a person gets. The time it takes to run a kilometer is which type of variable? a. Independent Variable

b. Dependent Variable

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.