Hugh-Leifson Oxidation-Fermentation (OF) Medium Differs from Carbohydrate Medium Used to Identify

Multiple Choice

Hugh-Leifson oxidation-fermentation (OF) medium differs from carbohydrate medium used to identify Enterobacteriaceae by all of the following characteristics except

A) brom thymol blue is used as the pH indicator.
B) a control tube is not required for OF medium.
C) there is a higher percentage of carbohydrate present in OF medium.
D) there is a lower concentration of protein present in OF medium.