Prescott's Microbiology
11th Edition
ISBN: 9781260211887
Author: WILLEY, Sandman, Wood
Publisher: McGraw Hill
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Chapter 19.4, Problem 4CC
You are building a tree based on 16S rRNA sequence alignments of a group of spirochetes. Suggest a possible outgroup so that you can build a rooted tree. Refer to chapter 21 if you need more information about these bacteria.
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In studying Lokiarchaeota, researchers identified eukaryotic signature genes and used this information to better understand the relationship between archaeans and eukaryotes. Many other types of genetic analysis can be used that focus on certain types of
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peptidoglycan synthesis genes
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membrane remodeling
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cytoskeletal
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ribosomal genes exotoxin genes
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Why does the genus Streptomyces of the Actinobacteria clade secrete chemicals (antibiotics) that can kill other bacterial species?
Please answer asap and type your answer and do not copy from anywhere please
Why did Carl Woese propose the domain Archaea?
The domain Bacteria already had too many organisms in its classification.
The methanogens were discovered to be a complex organism, between prokaryotic bacteria and eukaryotes, thus it needed its own domain.
He discovered that methanogens were too large to be classified as bacteria, but too small to be classified as Eukarya.
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Chapter 19 Solutions
Prescott's Microbiology
Ch. 19.1 - What is a natural classification? What microbial...Ch. 19.1 - Prob. 2CCCh. 19.1 - Consider the finding that bacteria capable of...Ch. 19.2 - What is the difference between a microbial species...Ch. 19.2 - Why is it important to have a type strain for each...Ch. 19.2 - The genus Salmonella was once thought to contain...Ch. 19.3 - What are the advantages of using each major group...Ch. 19.3 - Why is rRNA so suitable for determining...Ch. 19.3 - Prob. 3CCCh. 19.4 - Could a phylotype be considered an OTU? What about...
Ch. 19.4 - List the differences between distance-based and...Ch. 19.4 - Prob. 3CCCh. 19.4 - You are building a tree based on 16S rRNA sequence...Ch. 19.4 - Is HGT involved in movement of genes in the core...Ch. 19.5 - On what evidence is this hypothesis based?Ch. 19.5 - Construct a scenario in which each of the...Ch. 19.5 - Define ecotype. Do you think it is necessary to...Ch. 19.5 - What is the difference between the core genome and...Ch. 19.5 - Of the following genes, which do you think are...Ch. 19.5 - Prob. 4CCCh. 19.6 - Prob. 1CCCh. 19.6 - Describe two different situations in which it...Ch. 19 - Prob. 1RCCh. 19 - Prob. 2RCCh. 19 - Prob. 3RCCh. 19 - Prob. 4RCCh. 19 - Prob. 5RCCh. 19 - Prob. 6RCCh. 19 - Consider the fact that the use of 16S rRNA...Ch. 19 - You have recently established a pure culture of a...Ch. 19 - Prob. 3ALCh. 19 - Prob. 4ALCh. 19 - Prob. 5ALCh. 19 - Prob. 6ALCh. 19 - Prob. 7AL
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- What is the endosymbiotic theory? Discuss two lines of evidence that support the theory.arrow_forwardThere are three main ways that bacteria and archaea are essential to eukaryotic life. Explain the three different ways and give at least one example of each.arrow_forwardFor this assignment you will create a dichotomous key to help you Identify Bacteria (which are a pain in the bum to identify on the species level.) We will be focused on the general terms of bacteria and the only Phylum that will be addressed is the Cyanobacteria. Use the following to create a dichotomous key to begin to identify Bacteria: BACTERIA Bacillus Coccus Spirillium Phylum Cyanobacteria Gram (+) (-) Root nodules To Begin use the following question: Does the organism exhibit a membrane bound nucleus?arrow_forward
- Is it proper to list genus in this way in the example sentence below?The potential identity of the unknown bacteria could belong to genus Proteus, genus Providencia, or genus Serratia.Does the word genus need to be capatilzed? Do you need to say the word genus before it?.arrow_forwardWhat are the 4 characteristics/properties of rRNA genes which make them good molecular chronometers. Why viruses are not found in the tree of life? Why might viable cell cultures be of more use in microbial taxonomy than preserved specimens? Is it possible to provide a formal name for a microorganism that has not been cultivated in isolation? What kind of name might be used if a microorganism is well-characterized but cannot yet be cultivated in isolation?arrow_forwardImagine that you discover a new type of bacteria in an environment that is exposed to oxygen. A. What type of bacteria might you have discovered? B. Propose a mechanism by which they can produce the energy neededarrow_forward
- Construct a dichotomous key (design or presentation of your own choice; example is the diagram below) using the data of the bacteria in the list.arrow_forwardAccording to Philip Bell’s viral eukaryogenesis hypothesis, genes for DNA replication, RNA transcription, protein translation, and histone proteins were all provided by: an endosymbiotic gram-negative eubacterium an endosymbiotic archaeobacterium a gram-positive eubacterial host cell a double-stranded DNA virus an archaeobacterial host cellarrow_forwardRickettsia bacteria always lives as parasites inside eukaryotic cells, ad their genomes are much smaller then those of free living bacteria. Organisms that live only as parasites often have reduced genomes compared to the free living relatives. How could a parasitic lyfestyle contribute to a reduction in genome size?arrow_forward
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