11. Metalloids have some properties of metals and some properties of nonmetals* True
O
False
12. The columns in the periodic table are *
Ogroups
O periods
13.The rows in a table represent
O groups
Operiods

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.