Question

Contains Salt, which inhibits the growth of Gram Negative (-) microorganisms, therefore selective for Gram Positive (+) microorganisms?

Answer 1

Selective media containing salt can inhibit the growth of Gram-negative microorganisms and selectively promote the growth of Gram-positive microorganisms.

Step-by-step explanation:

Selective media are used to inhibit the growth of unwanted microorganisms and promote the growth of specific microorganisms. In this case, the presence of salt in the media inhibits the growth of Gram-negative microorganisms and favors the growth of Gram-positive microorganisms. Salt, such as in Mannitol Salt Agar, can create an osmotic stress that is tolerated by halotolerant bacteria, including Staphylococci. This selective growth condition helps researchers isolate and identify specific types of bacteria.