Which of the following are the correct name and function of structure a? a. nucleolus; ribosome assembly b. mitochondrion; converts energy stored in food into compounds the cell can use c. mitochondrion; regulates the movement of materials into and out of the cell d. nucleolus; converts energy stored in food into compounds the cell can use

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.