Biology Exploring Study Set 1

Biology

Quiz 13 :

Regulation of Gene Expression

Quiz 13 :

Regulation of Gene Expression

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What is the default state of a repressible operon such as the trp operon?
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A

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Why do prokaryotic organisms tend to undergo rapid and reversible alterations in their genes?
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D

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What is the main function of drones in a beehive?
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A

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Suppose that an E. coli has a mutation in its lac operon such that the Lac repressor could NOT bind the operator, even in the absence of lactose. What would be the result in terms of the function of the operon?
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Which of the following is a key difference between eukaryotic and prokaryotic genomes?
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Suppose that you observe a mutant E. coli in which CAP is always inactive. In the presence of lactose and low levels of glucose, what would you expect the gene expression from this mutant's lac operon to be?
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Which term refers to a cluster of genes transcribed into a single mRNA unit in the operon model?
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Genes in operons are transcribed in such a way as to share which of the following molecules?
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Where is the Trp repressor gene located?
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What is the single most important stage when regulating eukaryotic gene expression?
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Which of the following proteins binds to the operator in the operon model?
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Which of the following components of an operon is a molecule of DNA?
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Which of the following best describes the general strategy of metabolic gene regulation in prokaryotes?
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Suppose the lacI repressor gene is permanently silenced by a mutation. What would be the impact on the function of the lac operon?
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What is the essential difference in development of bees of different gender?
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What does the presence of lactose allow in the E. coli lac operon?
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Where does RNA polymerase first bind to on the E. coli lac operon?
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Suppose that a strain of E. coli containing a mutant lac operon is discovered. Also suppose that the mutant operon is normal in terms of its regulation, but the lacY gene produces a defective protein. Which metabolic function will be impaired in this bacterium?
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Which of the following best explains why E. coli shuts down the trp operon if tryptophan is available in the environment?
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In catabolite repression, what is indicated by high levels of cAMP?
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