Suppose That a Researcher Is Looking for Met^- Strains of E

question 10

Multiple Choice

Suppose that a researcher is looking for met^- strains of E. coli. She compares two plates. One plate has colonies growing on complete media. The other plate has colonies growing on methionine-deficient media. How can the researcher determine which colonies are met^-?

• A) by replica plating the plate with minimal media onto one with complete media
• B) by streaking all individual colonies on minimal media
• C) by replica plating the plate with complete media onto one with minimal media
• D) by growing the bacteria in broth media that is complete

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