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 14.2, Problem 3C
Summary Introduction

To explain: The reasons why trp operon is repressible and lac operon is inducible.

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. Repressible operons are turned off by the presence of the substrate. Trp operon is a repressible operon.

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Students have asked these similar questions
Why do scientists define the trp operon as repressible and the lac operon as inducible?
Gene expression in bacteria is controlled by the operon model.  a) Why is the operon model important? b) Why is the trp operon known as a repressible operon?
How do we know that the trp operon is a repressible controlsystem, in contrast to the lac operon, which is an induciblecontrol system?
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