How many miles of NH4CL are needed to prepare 250 mL of a 0.35 solution? A. 0.0875
B. 87.5
C. 0.0014
D. 25

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.