Attenuation of the trp operon fails to occur when
A) a lack of tryptophan causes stalling of ribosomes on the leader sequence of the RNA.
B) an RNA stem-loop forms that allows transcription to continue.
C) an RNA stem-loop that causes transcription to terminate fails to form.
D) the cell has enough tryptophan.
E) the operator is mutated.
Correct Answer:
Verified
Q1: The inducer of the lac operon is
A)galactose.
B)glucose.
C)allolactose.
D)repressor
Q2: What is the underlying reason that a
Q4: The order of the structural genes in
Q5: The interaction between allolactose and the repressor
Q6: Which positive regulatory protein is required for
Q7: To inhibit the transcription of operon genes,the
Q8: In terms of regulation of gene expression,tryptophan
Q9: In bacteriophage lambda,the establishment of lysogeny requires
Q10: Which of the following can be a
Q11: A lacOC mutation is
A)constitutive.
B)cis-dominant.
C)incompletely dominant.
D)codominant
E)recessive.
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