Question

1. bea is selective for which group? a. enterobacteriaceae b. staphylococci c. group d streptococci or enterococci d. pseudomonads 8. a positive result on bea is indicated by: a. red zone b. yellow slant

Explanation:

BEA (Bile - Esculin Agar) is a selective and differential medium. It is selective for Group D streptococci or enterococci as they can grow in the presence of bile salts and hydrolyze esculin. A positive result on BEA is indicated by the hydrolysis of esculin which reacts with ferric ions in the medium to produce a black - brown coloration. But among the given options for positive result indication, a positive result is indicated by a change in the medium's color related to esculin hydrolysis.

Answer:

1. C. Group D streptococci or enterococci
2. (No correct option given among A and B as a positive result on BEA is indicated by a black - brown coloration, not red zone or yellow slant)