Which statement best describes what occurs to a molecule of the enzyme trypsin after it binds to a molecule of protein? a) after binding to a protein molecule, the trypsin molecule is destroyed and must be replaced. b) the combined trypsin and protein molecule is utilized for energy to power cellular functions. c) after binding to the protein molecule, trypsin is converted to a lipid and used for energy storage. d) the trypsin molecule is not chemically altered by the reaction with protein and may be used again.