Multiple Choice
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
Correct Answer:
Verified
Q18: The _ pathway in lambda phage leads
Q19: The tryptophan codons of the attenuator sequence
Q20: Which of the following mutations is dominant
Q21: Why do lacO<sup>C</sup> mutants express in cis-dominant
Q22: In the lac operon in E.coli,a nonsense
Q24: What effect would mutational damage of the
Q25: The inducer of the lac operon is<br>A)galactose.<br>B)glucose.<br>C)allolactose.<br>D)repressor
Q26: Which positive regulatory protein is required for
Q27: What selective pressures are likely to have
Q28: The use of CAP- cAMP complex as