A researcher hypothesizes that expression of a particular gene is under positive transcriptional control. What evidence would support his hypothesis?
A) A repressor protein is discovered that blocks transcription of this gene.
B) The gene is only expressed when catabolite activator protein binds to an upstream DNA site.
C) The gene is no longer regulated when an upstream DNA region undergoes mutation.
D) Mutation of the gene itself does not affect its regulation.
Correct Answer:
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Q2: The lac operator consists of approximately 20
Q3: If E. coli is in an environment
Q4: A mutation in the i gene encoding
Q5: E. coli regulates the biosynthesis of the
Q6: Which information would be helpful in determining
Q8: Regulation of the lac operon by lactose
Q9: How do repressors differ from activators of
Q10: Two bacterial populations were prepared in
Q11: One way that a promoter differs from
Q12: TATA boxes are found
A) in enhancers only.
B)
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