Chapter 14: Problem 1
What is the difference between a constitutive gene and a regulated gene?
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Chapter 14: Problem 1
What is the difference between a constitutive gene and a regulated gene?
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What is enzyme adaptation? From a genetic point of view, how does it occur?
As described in Chapter 13, enzymes known as aminoacyl-tRNA synthetases are responsible for attaching amino acids to tRNAs. Let's suppose that in a mutant bacterium tryptophanyl-tRNA synthetase has a reduced ability to attach tryptophan to tRNA: its activity is only \(10 \%\) of that found in a normal bacterium. How would attenuation of the \(\operatorname{trp}\) operon be affected? Would the operon be more or less likely to be attenuated? Explain your answer.
How are the actions of lac repressor and trp repressor similar and how are they different with regard to their binding to operator sites, their effects on transcription, and the influences of small effector molecules?
An operon is repressible-a small effector molecule turns off its transcription. Which combination(s) of small effector molecule and regulatory protein could be involved in this process? A. An inducer plus a repressor B. A corepressor plus a repressor C. An inhibitor plus an activator D. An inducer plus an activator
What is meant by the term attenuation? Is it an example of gene regulation at the level of transcription or translation? Explain your answer.
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