The table shows the density of three substances. which statement is true about the 3 substances a) mercury is less dense than the others
b) mercury is denser than the 2 solids
c) metals are denser than liquids at room temperature
d) the density of mercury is greater because it occupies more space

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.