Which of the following si or metric units is a base unit?
1.pascal
2.newton
3.ampere
4.joule
i think it would be ampere. if you have the answer can you explain why its 1 2 3 or 4.

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.