Refer to the image of the bacterial plates below A few bacterial strains were sp

Question

Refer to the image of the bacterial plates below A few bacterial strains were spotted on a master plate that contained minimal media and the amino acids tryptophan, lysine, arginine. The strains were then replica plated onto plates with minimal media and various combinations of amino acids. Use these images to determine the genotypes of the bacterial strains Master Plate Lys, Trp Arg, Trp Arg, Lys What is the genotype of bacterial strain C? Select one O a Lys+ Arg+ Trp+ O b. Lys+ Arg- Trp+ Oc. Lys+Arg+Trp- O d. Lys-Arg+ Trp+ O e. Lys- Arg+ Trp- O f. Lys- Arg- Trp-

Explanation / Answer

The correct option is D) Lys_ , Arg+ , Trp+.

Because, the bacterial strain 'C' has genes which can synthesize the aminoacids, Arg and Trp. Thats why, it grown even in the media which lacked these both aminoacids. However, it didn't have any genes to synthesize lysine. Because, in media where lysine was absent, it didn't grow and only grown in the presence of lysine.

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