Campbell Biology in Focus (2nd Edition)
Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780321962751
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Chapter 15, Problem 4TYU
Summary Introduction

Introduction:

Operon refers to the functional unit of the DNA (genomic). It consist of various genes that controls operon’s regulation. There are two types of operons; lac (lactose) and Trp (tryptophan).

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Which statement about the transcription attenuation mechanism is TRUE? 1.In some operons (e.g., the his operon), attenuation may be the only regulatory mechanism.   2. Sequences of the trp operon leader RNA resemble an operator.   3. The leader peptide acts by a mechanism that is similar to that of a repressor protein.   4.The leader peptide gene of the trp operon includes no Trp codons.   5. The leader peptide is an enzyme that catalyzes transcription attenuation.
A mutation in the operator region of the trp operon can prevent the trp repressor from binding to this operator. When these mutant cells are placed in a solution containing chicken broth, which of the following happens? a. Tryptophan would bind to the repressor. b. The Repressor would bind to the operator irrespective of the presence of amino acids in the environment.  c. The transcription of the trip operon would be inhibited. d. The transcription of the repressor protein is inhibited
What is the role of a substrate that controls a repressible operon?   a. increase the production of inactive repressor proteins   b. bind to the repressor protein and activate it   c. bind to the repressor protein and deactivate it   d. bind to the promoter region and decrease the affinity of RNA polymerase for the promoter
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