In the Kligler’s Iron Agar (KIA) test, if an organism produces hydrogen sulfide gas, the butt of the agar slant turns, and the slanted surface of the agar will be after 24 hours of incubation.

All of the following statements about enzymes are correct except: proteolytic enzymes are also known as proteases. pectin methyl esterase causes browning of cut fruit. cloud loss in orange juice is due to enzyme activity. proteolytic enzymes in fish cause tissue softening during storage.