Which of the following gases occupy the largest volume at STP? O A) 10.0 g of H2
O B) 10.0 g of N2
O C) 10.0 g of O2
OD) 10.0 g of F2
O E) They all have the
me volume.

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.