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Biology, 03.12.2019 02:10 squirt3747

This chapter contains a lengthy discussion of the trp operon involved in regulating the synthesis of tryptophan. in the case of e. coli, the bacterium may need to synthesize tryptophan, or its host, a human, may supply all the tryptophan it needs. think back to chapter 17. why do both bacteria and humans need tryptophan? (etext concept 18.1)

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