What experiment did Robert Millikan do? A. He shot tiny positively charged particles through a thin gold sheet.
B. He first discovered electricity could flow through metal plates.
C. He used voltage adjustments to make charged oil drops float.
D. He measured how a cathode ray bent when it passed through
charged plates

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.