a. To determine: The reason behind the appearance of white color of luxR/lacZ colonies in the absence of autoinducer. Introduction: In an experiment to understand the molecular mechanism of quorum sensing, the use of two transcriptional fusion reporter genes was involved each having the 9 kb fragment of Vibrio fischeri DNA.

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Answer 1

Question

Chapter 15, Problem 37P

Summary Introduction

a.

To determine:

The reason behind the appearance of white color of luxR/lacZ colonies in the absence of autoinducer.

Introduction:

In an experiment to understand the molecular mechanism of quorum sensing, the use of two transcriptional fusion reporter genes was involved each having the 9 kb fragment of Vibrio fischeri DNA.

Summary Introduction

b.

To determine:

The reason behind the appearance of white color of luxICDABE/lacZ colonies in the absence of autoinducer.

Introduction:

In a reporter known as luxICDABE/lacZ, the luxICDABE operon regulatory sequences drive lacZ expression. It means that the structural genes of the operon are replaced by the lacZ coding sequences.

Summary Introduction

c.

To determine:

The reason behind the appearance of white color of luxR/lacZ colonies in the presence of autoinducer.

Introduction:

In the reporter known as luxR/lacZ, the luxR regulatory region drives the transcription of lacZ. It means that the luxR coding sequences are replaced by the lacZ.

Summary Introduction

d.

To determine:

The reason behind the appearance of blue colored luxICDABE/lacZ colonies in the presence of autoinducer and the time-dependency of the reaction.

Introduction:

The E.coli that contains either of the reporter (luxR/lacZ or luxICDABE/lacZ) has white colonies. When the purified autoinducer is added to the media, the luxR/lacZ colonies remain white but the luxICDABE/lacZ colonies turn blue over time.

Summary Introduction

e.

To determine:

The inference that can be made out about the transcription of the luxR gene from the given results.

Introduction:

The regulatory region of luxR drives the transcription of the lacZ gene. It indicates that the coding sequence of luxR is replaced by the coding sequence of lacZ.

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Answer 2

Question

Chapter 15, Problem 37P

Summary Introduction

a.

To determine:

The reason behind the appearance of white color of luxR/lacZ colonies in the absence of autoinducer.

Introduction:

In an experiment to understand the molecular mechanism of quorum sensing, the use of two transcriptional fusion reporter genes was involved each having the 9 kb fragment of Vibrio fischeri DNA.

Summary Introduction

b.

To determine:

The reason behind the appearance of white color of luxICDABE/lacZ colonies in the absence of autoinducer.

Introduction:

In a reporter known as luxICDABE/lacZ, the luxICDABE operon regulatory sequences drive lacZ expression. It means that the structural genes of the operon are replaced by the lacZ coding sequences.

Summary Introduction

c.

To determine:

The reason behind the appearance of white color of luxR/lacZ colonies in the presence of autoinducer.

Introduction:

In the reporter known as luxR/lacZ, the luxR regulatory region drives the transcription of lacZ. It means that the luxR coding sequences are replaced by the lacZ.

Summary Introduction

d.

To determine:

The reason behind the appearance of blue colored luxICDABE/lacZ colonies in the presence of autoinducer and the time-dependency of the reaction.

Introduction:

The E.coli that contains either of the reporter (luxR/lacZ or luxICDABE/lacZ) has white colonies. When the purified autoinducer is added to the media, the luxR/lacZ colonies remain white but the luxICDABE/lacZ colonies turn blue over time.

Summary Introduction

e.

To determine:

The inference that can be made out about the transcription of the luxR gene from the given results.

Introduction:

The regulatory region of luxR drives the transcription of the lacZ gene. It indicates that the coding sequence of luxR is replaced by the coding sequence of lacZ.

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Answer 3

Question

Chapter 15, Problem 37P

Summary Introduction

a.

To determine:

The reason behind the appearance of white color of luxR/lacZ colonies in the absence of autoinducer.

Introduction:

In an experiment to understand the molecular mechanism of quorum sensing, the use of two transcriptional fusion reporter genes was involved each having the 9 kb fragment of Vibrio fischeri DNA.

Summary Introduction

b.

To determine:

The reason behind the appearance of white color of luxICDABE/lacZ colonies in the absence of autoinducer.

Introduction:

In a reporter known as luxICDABE/lacZ, the luxICDABE operon regulatory sequences drive lacZ expression. It means that the structural genes of the operon are replaced by the lacZ coding sequences.

Summary Introduction

c.

To determine:

The reason behind the appearance of white color of luxR/lacZ colonies in the presence of autoinducer.

Introduction:

In the reporter known as luxR/lacZ, the luxR regulatory region drives the transcription of lacZ. It means that the luxR coding sequences are replaced by the lacZ.

Summary Introduction

d.

To determine:

The reason behind the appearance of blue colored luxICDABE/lacZ colonies in the presence of autoinducer and the time-dependency of the reaction.

Introduction:

The E.coli that contains either of the reporter (luxR/lacZ or luxICDABE/lacZ) has white colonies. When the purified autoinducer is added to the media, the luxR/lacZ colonies remain white but the luxICDABE/lacZ colonies turn blue over time.

Summary Introduction

e.

To determine:

The inference that can be made out about the transcription of the luxR gene from the given results.

Introduction:

The regulatory region of luxR drives the transcription of the lacZ gene. It indicates that the coding sequence of luxR is replaced by the coding sequence of lacZ.

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Answer 4

Question

Chapter 15, Problem 37P

Summary Introduction

a.

To determine:

The reason behind the appearance of white color of luxR/lacZ colonies in the absence of autoinducer.

Introduction:

In an experiment to understand the molecular mechanism of quorum sensing, the use of two transcriptional fusion reporter genes was involved each having the 9 kb fragment of Vibrio fischeri DNA.

Summary Introduction

b.

To determine:

The reason behind the appearance of white color of luxICDABE/lacZ colonies in the absence of autoinducer.

Introduction:

In a reporter known as luxICDABE/lacZ, the luxICDABE operon regulatory sequences drive lacZ expression. It means that the structural genes of the operon are replaced by the lacZ coding sequences.

Summary Introduction

c.

To determine:

The reason behind the appearance of white color of luxR/lacZ colonies in the presence of autoinducer.

Introduction:

In the reporter known as luxR/lacZ, the luxR regulatory region drives the transcription of lacZ. It means that the luxR coding sequences are replaced by the lacZ.

Summary Introduction

d.

To determine:

The reason behind the appearance of blue colored luxICDABE/lacZ colonies in the presence of autoinducer and the time-dependency of the reaction.

Introduction:

The E.coli that contains either of the reporter (luxR/lacZ or luxICDABE/lacZ) has white colonies. When the purified autoinducer is added to the media, the luxR/lacZ colonies remain white but the luxICDABE/lacZ colonies turn blue over time.

Summary Introduction

e.

To determine:

The inference that can be made out about the transcription of the luxR gene from the given results.

Introduction:

The regulatory region of luxR drives the transcription of the lacZ gene. It indicates that the coding sequence of luxR is replaced by the coding sequence of lacZ.

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Answer 5

Chapter 15, Problem 37P

Summary Introduction

a.

To determine:

The reason behind the appearance of white color of luxR/lacZ colonies in the absence of autoinducer.

Introduction:

In an experiment to understand the molecular mechanism of quorum sensing, the use of two transcriptional fusion reporter genes was involved each having the 9 kb fragment of Vibrio fischeri DNA.

Summary Introduction

b.

To determine:

The reason behind the appearance of white color of luxICDABE/lacZ colonies in the absence of autoinducer.

Introduction:

In a reporter known as luxICDABE/lacZ, the luxICDABE operon regulatory sequences drive lacZ expression. It means that the structural genes of the operon are replaced by the lacZ coding sequences.

Summary Introduction

c.

To determine:

The reason behind the appearance of white color of luxR/lacZ colonies in the presence of autoinducer.

Introduction:

In the reporter known as luxR/lacZ, the luxR regulatory region drives the transcription of lacZ. It means that the luxR coding sequences are replaced by the lacZ.

Summary Introduction

d.

To determine:

The reason behind the appearance of blue colored luxICDABE/lacZ colonies in the presence of autoinducer and the time-dependency of the reaction.

Introduction:

The E.coli that contains either of the reporter (luxR/lacZ or luxICDABE/lacZ) has white colonies. When the purified autoinducer is added to the media, the luxR/lacZ colonies remain white but the luxICDABE/lacZ colonies turn blue over time.

Summary Introduction

e.

To determine:

The inference that can be made out about the transcription of the luxR gene from the given results.

Introduction:

The regulatory region of luxR drives the transcription of the lacZ gene. It indicates that the coding sequence of luxR is replaced by the coding sequence of lacZ.

Answer 6

Chapter 15, Problem 37P

Summary Introduction

a.

To determine:

The reason behind the appearance of white color of luxR/lacZ colonies in the absence of autoinducer.

Introduction:

In an experiment to understand the molecular mechanism of quorum sensing, the use of two transcriptional fusion reporter genes was involved each having the 9 kb fragment of Vibrio fischeri DNA.

Answer 7

Chapter 15, Problem 37P

Summary Introduction

a.

To determine:

The reason behind the appearance of white color of luxR/lacZ colonies in the absence of autoinducer.

Introduction:

In an experiment to understand the molecular mechanism of quorum sensing, the use of two transcriptional fusion reporter genes was involved each having the 9 kb fragment of Vibrio fischeri DNA.

Answer 8

Summary Introduction

b.

To determine:

The reason behind the appearance of white color of luxICDABE/lacZ colonies in the absence of autoinducer.

Introduction:

In a reporter known as luxICDABE/lacZ, the luxICDABE operon regulatory sequences drive lacZ expression. It means that the structural genes of the operon are replaced by the lacZ coding sequences.

Answer 9

Summary Introduction

b.

To determine:

The reason behind the appearance of white color of luxICDABE/lacZ colonies in the absence of autoinducer.

Introduction:

In a reporter known as luxICDABE/lacZ, the luxICDABE operon regulatory sequences drive lacZ expression. It means that the structural genes of the operon are replaced by the lacZ coding sequences.

Answer 10

Summary Introduction

c.

To determine:

The reason behind the appearance of white color of luxR/lacZ colonies in the presence of autoinducer.

Introduction:

In the reporter known as luxR/lacZ, the luxR regulatory region drives the transcription of lacZ. It means that the luxR coding sequences are replaced by the lacZ.

Answer 11

Summary Introduction

c.

To determine:

The reason behind the appearance of white color of luxR/lacZ colonies in the presence of autoinducer.

Introduction:

In the reporter known as luxR/lacZ, the luxR regulatory region drives the transcription of lacZ. It means that the luxR coding sequences are replaced by the lacZ.

Answer 12

Summary Introduction

d.

To determine:

The reason behind the appearance of blue colored luxICDABE/lacZ colonies in the presence of autoinducer and the time-dependency of the reaction.

Introduction:

The E.coli that contains either of the reporter (luxR/lacZ or luxICDABE/lacZ) has white colonies. When the purified autoinducer is added to the media, the luxR/lacZ colonies remain white but the luxICDABE/lacZ colonies turn blue over time.

Answer 13

Summary Introduction

d.

To determine:

The reason behind the appearance of blue colored luxICDABE/lacZ colonies in the presence of autoinducer and the time-dependency of the reaction.

Introduction:

The E.coli that contains either of the reporter (luxR/lacZ or luxICDABE/lacZ) has white colonies. When the purified autoinducer is added to the media, the luxR/lacZ colonies remain white but the luxICDABE/lacZ colonies turn blue over time.

Answer 14

Summary Introduction

e.

To determine:

The inference that can be made out about the transcription of the luxR gene from the given results.

Introduction:

The regulatory region of luxR drives the transcription of the lacZ gene. It indicates that the coding sequence of luxR is replaced by the coding sequence of lacZ.

Answer 15

Summary Introduction

e.

To determine:

The inference that can be made out about the transcription of the luxR gene from the given results.

Introduction:

The regulatory region of luxR drives the transcription of the lacZ gene. It indicates that the coding sequence of luxR is replaced by the coding sequence of lacZ.

Answer 16

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Answer 17

Expert Solution & Answer

Answer 18

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Answer 19

Ch. 15 - For each of the terms in the left column, choose...Ch. 15 - The following statement occurs early in this...Ch. 15 - One of the main lessons of this chapter is that...Ch. 15 - All mutations that abolish function of the Rho...Ch. 15 - The promoter of an operon is the site to which RNA...Ch. 15 - You are studying an operon containing three genes...Ch. 15 - Prob. 7P Ch. 15 - You have isolated two different mutants reg1 and...Ch. 15 - Bacteriophage , after infecting a cell, can...Ch. 15 - Mutants were isolated in which the constitutive...

Solution Summary: The author analyzes the molecular mechanism of quorum sensing using two transcriptional fusion reporter genes. In the absence of autoinducer, the luxICDABE operon regulatory sequences drive lacZ expression.

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c.

To determine:

The reason behind the appearance of white color of luxR/lacZ colonies in the presence of autoinducer.

Introduction:

In the reporter known as luxR/lacZ, the luxR regulatory region drives the transcription of lacZ. It means that the luxR coding sequences are replaced by the lacZ.

e.

To determine:

The inference that can be made out about the transcription of the luxR gene from the given results.

Introduction:

The regulatory region of luxR drives the transcription of the lacZ gene. It indicates that the coding sequence of luxR is replaced by the coding sequence of lacZ.

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Chapter 15 Solutions

Solution Summary: The author analyzes the molecular mechanism of quorum sensing using two transcriptional fusion reporter genes. In the absence of autoinducer, the luxICDABE operon regulatory sequences drive lacZ expression.

Concept explainers

Videos

c. To determine: The reason behind the appearance of white color of luxR/lacZ colonies in the presence of autoinducer. Introduction: In the reporter known as luxR/lacZ, the luxR regulatory region drives the transcription of lacZ. It means that the luxR coding sequences are replaced by the lacZ.

e. To determine: The inference that can be made out about the transcription of the luxR gene from the given results. Introduction: The regulatory region of luxR drives the transcription of the lacZ gene. It indicates that the coding sequence of luxR is replaced by the coding sequence of lacZ.

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Chapter 15 Solutions

c.

To determine:

The reason behind the appearance of white color of luxR/lacZ colonies in the presence of autoinducer.

Introduction:

In the reporter known as luxR/lacZ, the luxR regulatory region drives the transcription of lacZ. It means that the luxR coding sequences are replaced by the lacZ.

e.

To determine:

The inference that can be made out about the transcription of the luxR gene from the given results.

Introduction:

The regulatory region of luxR drives the transcription of the lacZ gene. It indicates that the coding sequence of luxR is replaced by the coding sequence of lacZ.