The trp operon in E. coli is regulated in such a manner as to allow expression of the genes only when cellular levels of tryptophan are low. When tryptophan levels are adequate, the secondary structure of the mRNA halts translation. This form of regulation is known as
A) negative regulatory control.
B) repression.
C) attenuation.
D) positive regulatory control.
E) transcriptional regulation.
Correct Answer:
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Q1: A person with the genotype XXXY would
Q2: Effector molecules
A)are often small organic molecules.
B)are associated
Q3: You are studying a biochemical pathway. Preliminary
Q4: An E.coli cell with the genotype lacOc
Q5: Which of the following does NOT apply
Q6: The lac repressor is
A)active when glucose is
Q8: The main chromosome of a bacterial cell
Q9: The situation in which an active regulatory
Q10: Which of the following is an example
Q11: Riboswitches have been observed in
A)algae.
B)prokaryotes.
C)eukaryotes.
D)yeast.
E)fungi.
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