An ionic compound is formed when
!
a. a metal bonds with another metal
b. a metal bonds with a nonmetal
c. three nonmetals bond together
d. a nonmetal bonds with another nonmetal

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.