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