Biological Science (7th Edition)
Biological Science (7th Edition)
7th Edition
ISBN: 9780134678320
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Greg Podgorski, Emily Taylor, Jeff Carmichael
Publisher: PEARSON
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Chapter 19, Problem 5TYU

Compare and contrast the items in each pair: (a) enhancers and the E. coli araC binding site (see Chapter 18); (b) promoter-proximal elements and the operator of the lac operon; (c) general transcription factors and sigma.

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A mutation that inactivates the repressor gene of the lac operon results in (a) the continuous transcription of the structural genes (b) no transcription of the structural genes (c) the binding of the repressor to the operator (d) no production of RNA polymerase (e) no difference in the rate of transcription
. If a particular operon encodes enzymes for makingan essential amino acid and is regulated like thetrp operon, then(A) the amino acid inactivates the repressor.(B) the repressor is active in the absence of theamino acid.(C) the amino acid acts as a corepressor.(D) the amino acid turns on transcription of the operon
What would occur if the repressor of an inducible operon weremutated so it could not bind the operator?(A) irreversible binding of the repressor to the promoter(B) reduced transcription of the operon’s genes(C) buildup of a substrate for the pathway controlled by theoperon(D) continuous transcription of the operon’s genes
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