1 Based on the graph below, during which day did the most seeds sprout n 100 80 60 40 20 0 0 Time (days) 4 5 1 2 3 3

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.