Consider a culture medium on which only gram-positive organisms such as Staphylococcus aureus colonies can grow due to an elevat
ed 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(n) _________.
Based on the information provided within the question it seems that this type of medium would be referred to as a selective and differential medium
. This is because such high NaCL levels are designed to stimulate and allow selective bacteria to grow, while also differential media because the fermented sugar is giving off a yellow halo which allows for the differentiate between the bacteria.
I hope this answered your question. If you have any more questions feel free to ask away at Brainly.
