In the biochemical assay lab, test tubes a and b were treated with onpg. after 15 minutes of incubation, test tube a turned a yellow color while test tube b remained a clear color. test tube contained which reacted with onpg to produce and . select one: a. b, b-galactosidase, lactose, na2co3 b. a, b-galactosidase, galactose, o-nitrophenol c. a, glucose, na2co3, lactose d. b, lactose, glucose, o-nitrophenol e. a, lactose, lactose, o-nitrophenol