5. Genetics of Bacteria and Viruses
Working with Microorganisms
2:01 minutes
Problem 26
Textbook Question
Textbook QuestionDevise an experiment to identify bacteria that are auxotrophic and unable to produce two amino acids, lysine (lys) and valine (val). The auxotrophic bacteria are in a pool of bacteria in which all the other bacteria are prototrophic. The genotype of the auxotrophs is lys⁻ val⁻. Describe each step in the experiment, identify the constituents in any growth medium or growth plates you propose, and identify the results that will conclusively identify bacteria that are lys⁻ val⁻.
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