Biology (MindTap Course List)
Biology (MindTap Course List)
11th Edition
ISBN: 9781337392938
Author: Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher: Cengage Learning
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Chapter 14, Problem 2TYU
Summary Introduction

Introduction: Operons are a set of genes containing a promoter and one or more operators that helps to control the transcription process. Each operon is made of structural genes, promoter and operator. Inducible operons are turned on by the presence of the substrate. Lac operon is an inducible operon.

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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
The regulation of the trp operon genes by the Trp repressor protein is an example of ______ gene regulation. A.)positive B.)negative
1. (a)  Binding of inducer protein to repressor protein     Gene is switched ON     Gene is switched OFF     Does NOT affect the gene expression (b)  Repressor protein binding at DNA upstream     Gene is switched ON     Gene is switched OFF     Does NOT affect the gene expression (c)  Operator is not bound with the repressor     Gene is switched ON     Gene is switched OFF     Does NOT affect the gene expression
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