Genetics From Genes to Genomes Study Set 1

Biology

Quiz 16 :
Gene Regulation in Prokaryotes

Quiz 16 :
Gene Regulation in Prokaryotes

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A crucial step in the regulation of most bacterial genes occurs
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What would be the phenotype of a null mutation in the gene encoding Lac repressor?
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A

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Transcription and translation can be coupled in bacteria but not eukaryotes because
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How do negative regulators such as the Lac repressor prevent RNA polymerase from initiating transcription?
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How does a positive regulator affect transcription by RNA polymerase in prokaryotes?
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Proteins whose conformations change when they are bound to an effector molecule are called
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Catabolic pathways that break down complex substances into more usable units are usually regulated in response to the
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Anabolic pathways involved in the synthesis of essential molecules are usually regulated in response to
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Which statement accurately describes global gene regulation in bacteria?
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How is glucose involved in catabolite repression of the lac operon?
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The function of a helix-turn-helix motif in a transcription factor is to
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How does tryptophan, the end product of the trp operon, function in the regulation of the operon?
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What term describes regulation of the trp operon that can occur even in trpR− mutants, thus suggesting that the mechanism is repressor-independent?
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In E.coli the heat shock response, which alters the proteins produced by the cell at different temperatures, is mediated by
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As a general principle of gene regulation through operons, regulatory genes encode
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In the trp operon, attenuation occurs through translation of two Trp codons in the leader sequence.What would happen if these two codons were mutated to stop codons?
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Initiation of transcription by RNA polymerase involves the binding of which of the following subunits to the core enzyme?
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The transition from transcriptional initiation to elongation involves
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Which molecules are examples of effector molecules?
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A single DNA unit that enables the simultaneous regulation of more than one coding region in response to environmental changes is called a(n)
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