Draw the Lewis structures of N2, O2, H20, and CH4. Compare your drawing to the ones in the drawing on this test and select the answer that best describes which drawing is wrong and why. O2 Is wrong because it shows the electrons at a 45 degree angle to the Oxygen atoms.
H2O is wrong because it is missing 4 valence electrons.

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.