There are two strains of E. coli, let's call them
strain A and B. Both are his- mutants. A his-
mutant is unable to synthesize the amino acid
histidine. Both strains are unable to grow on
chemically defined media if the media is not
supplemented with histidine. Careful analysis of
strain A demonstrated that the mRNA for
histidine genes is transcribed but not translated.
No histidine mRNA was present in the cytosol of
strain B. How is this possible?
Answers: 2
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Connection compare and contrast genetic engineering to the process of natural selection. select all statements that are true.
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There are two strains of E. coli, let's call them
strain A and B. Both are his- mutants. A his-
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