Which of the following statements is true? 1. The molecules of liquid water have less kinetic energy than those of water vapor.

2. The molecules of liquid water interact with one another, and those of water vapor do not.

3. The molecules of liquid water and water vapor have a different atomic composition.

4. The molecules of liquid water are bigger than the molecules of water vapor.

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.