_C4H6O3 + _H2O −−→ _C2H4O2

A) 1, 1, 2
B) 2, 1, 1
C) 2, 1, 2
D) 2, 2, 1

Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.