Differential medium can separate gram negative bacteria from
grampositive bacteria.
true or false?

True. Selective media can be used to separate gram negative from gram positive bacteria.

Explanation: Selective media allow certain types of organisms to grow, and inhibit  the growth of other organisms.

For example: Media containing potassium  tellurite will  inhibit the growth of gram negative bacteria while media supplemented with penicillin will inhibit the growth of gram positive  bacteria.