Methylene blue in EMB agar is selective for
A) gram-positives.
B) gram-negatives.
C) viral plaques.
D) both gram-positives and gram-negatives.

Question

Quizplus · Accepted Answer

Methylene blue in EMB agar is selective for gram-negative bacteria. The dye inhibits the growth of gram-positive bacteria and allows only gram-negative bacteria to grow on the agar, which forms distinctive colonies.

Methylene Blue in EMB Agar Is Selective for