Microbiology: A Systems Approach
Microbiology: A Systems Approach
4th Edition
ISBN: 9780073402437
Author: Marjorie Kelly Cowan Professor
Publisher: McGraw-Hill Education
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Chapter 9, Problem 1CF
Summary Introduction

To explain:

The way through which understanding bioluminescent bacteria and the lux operon can help people to understand other bacterial processes.

Introduction:

The bioluminescent bacteria produce light in sea water, marine sediments, and gut of marine organisms and surface of the decomposing fish. Molecular oxygen allows those bacteria to produce light, and this is termed as bacterial bioluminescence, which is supplied from the external cellular environment.

The lux operon is an operon that regulates the production of “luciferase”, the enzyme responsible for the emission of light by bioluminescent bacteria.

Expert Solution & Answer
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Explanation of Solution

The study of bioluminescent bacteria and lux operon can be useful to understand the other bacterial processes. For example, Vibrio fisheri and Vibrio harveyi contain lux operon that can be studied to understand bacterial processes. Vibrio fisheri is a microorganism that can live either alone or symbiotically with the bobtail squid. Vibrio harveyi inhabit on shrimp and other marine organisms.

In such microns, lux operon contains five different genes that cause the regulation of bioluminescence. The proteins that are produced from this operon associate to produce luciferase and bioluminescence by emitting photons of light.

The genes present in lux operon transcribed and translated at certain times, because, they have the required energy for their transcription and translation. “Autoinducer” is a signaling molecule produced by bacteria. As the bacteria achieve to a certain concentration, the autoinducer also achieves a concentration that can be detected by all the bacteria within the immediate area. The higher concentration of autoinducer provides signals to the bacteria to produce luciferase and bioluminescence; this is known as “quorum sensing”. Bacteria are unable to produce light until they have achieved a higher concentration.

The concentration required by bacteria to produce luciferase and bioluminescence is 1012 cells/ml for the production of light.

Conclusion

Quorum sensing is a process occurring in bioluminescent bacteria and the lux operon that can help people to understand other bacterial processes.

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Chapter 9 Solutions

Microbiology: A Systems Approach

Ch. 9.2 - Identify the locations of the promoter, the start...Ch. 9.2 - Prob. 12AYPCh. 9.2 - Prob. 13AYPCh. 9.3 - Define the term operon and explain one advantage...Ch. 9.3 - Differentiate between repressive and inducible...Ch. 9.3 - Prob. 16AYPCh. 9.4 - Explain the defining characteristics of a...Ch. 9.4 - Describe three forms of horizontal gene transfer...Ch. 9.5 - Prob. 19AYPCh. 9.5 - Prob. 20AYPCh. 9 - Prob. 1CFCh. 9 - What is the smallest unit of heredity? a....Ch. 9 - The nitrogen bases in DNA are bonded to the a....Ch. 9 - DNA replication is semiconservative because the...Ch. 9 - In DNA, adenine is the complementary base for...Ch. 9 - Transfer RNA is the molecule that a. contributes...Ch. 9 - Prob. 6MCQCh. 9 - The lac operon is usually in the _____ position...Ch. 9 - Prob. 8MCQCh. 9 - Prob. 9MCQCh. 9 - When genes are turned on differently under...Ch. 9 - The DNA pairs are held together primarily by...Ch. 9 - Prob. 12TFCh. 9 - Prob. 13TFCh. 9 - Prob. 14TFCh. 9 - Prob. 15TFCh. 9 - Explain the relationship among the following...Ch. 9 - Prob. 2CTQCh. 9 - On paper, replicate the following segment of DNA:...Ch. 9 - Provide evidence in support of or refuting the...Ch. 9 - Prob. 5CTQCh. 9 - Prob. 6CTQCh. 9 - Prob. 7CTQCh. 9 - Prob. 8CTQCh. 9 - Prob. 9CTQCh. 9 - Use your knowledge of DNA recombination events to...Ch. 9 - Prob. 1CCCh. 9 - Prob. 2CCCh. 9 - Prob. 3CCCh. 9 - Prob. 1VCCh. 9 - From chapter 4, figure 4.11a. Speculate on why...Ch. 9 - Concept Mapping | Blooms Level 6: Create Appendix...
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