Tryprophan Operon: set of genes in E. coli that allows for the synthesis of tryptophan
: continuously transcribed at low [Trp]
: at high [Trp], the operon is repressed since Trp is readily available and need not be synthesized
Some mutations in the trp 5'–UTR region increase termination by the attenuator. An example of a mutation that may have this effect is a
A. mutation that changes the bases in region 3 of the 5'–UTR, such that they no longer pair with region 2 or 4.
B. deletion of the two tryptophan codons in the 5'–UTR leader peptide.
C. deletion in region 2 in the 5'–UTR that prevents it from pairing with region 3.
D. B and C are correct.
E. A, B, and C are all correct.
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