QwizdomLect20-22 - histones resistant to acetylation. What...

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Qwizdom Q’s Lectures 20-22
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What is the normal function of the lacI gene product? A) Induce expression of the lacZ and lacY genes B) Repress expression of the lacZ and lacY genes C) Activate the lacZ and lacY gene products D) Inhibit the breakdown of lactose
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Why does it make sense that the products of metabolic biosynthetic (anabolic) pathways negatively regulate prokaryotic operons? A) If the cell already has a storehouse of the product, making more wastes chemical energy B) Macromolecules in metabolic pathways cannot be inducers C) The only mechanism for regulating operons is the repressor
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Which is most likely to occur to the Trp repressor protein when tryptophan binds to it? A) The helix-turn-helix DNA-binding motif straightens out and is no longer L-shaped. B) The two polypeptide subunits of the Trp repressor dissociate. C) A conformational change brings the helix-turn- helix motifs into register with the major groove of the double-stranded DNA helix
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Imagine you isolate a yeast mutant that has
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Unformatted text preview: histones resistant to acetylation. What phenotype do you predict for this mutant? A) Mutant will grow rapidly (by cell division) B) Mutant will require galactose for growth C) Mutant will show generally low levels of gene expression D) Mutant will show high levels of gene expression for a few select genes The greater complexity of gene regulation in multicellular eukaryotes relative to prokaryotes most likely is needed for multicellular eukaryotic cells to: A) undergo development and differentiation B) respond to extracellular signals C) respond to rapidly changing extracellular environments D) express different sets of genes under conditions of cellular stress In comparing a cell from the petal of a flower with a root cell in a plant youre likely to find the greatest differences in each cells content of: A) Promoters B) Promoter-proximal elements C) Enhancers D) Basal transcription factors E) Regulatory transcription factors...
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QwizdomLect20-22 - histones resistant to acetylation. What...

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