The following picture shows growth of five strains of bacera (A,B, C, D, and E)

Question

The following picture shows growth of five strains of bacera (A,B, C, D, and E) on media supplied with different compounds. Minimal media includes only those nutrients necessary for a wild-type strain to grow (essentially just an energy source). For example, strain C and D grow well on minimal media, while strains A, B, and E do not. Based on the growth paterns for the other media plates, what is the genotype of strain B with respect to met and arg? (Large dots indicate growth, small dots indicate no growth) minimal + met only A B minimal minimal +arg only + met + arg minimal A B A B A B met+ arg+ met- arg- met-arg+ met+ arg- The same as strain A

Explanation / Answer

Answer:- Option C ( met- arg+)

Explanation:- since strain B grows only in medium containing argenine whereas in methionine medium it does not show growth. Whereas when both are present in minimal medium it shows growth but only argenine is required for growth whereas methionine is required for strain A not for strain B.

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