Prescott's Microbiology
11th Edition
ISBN: 9781260211887
Author: WILLEY, Sandman, Wood
Publisher: McGraw Hill
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Chapter 19.2, Problem 3CC
The genus Salmonella was once thought to contain five species. Most scientists now consider only two species valid: S. bongori and S. enterica. The latter contains six subspecies, and S. enterica subspecies enterica is further subdivided into eight serovars. Three of these, Enteritidis, Typhi, and Typhimurium, were once considered Salmonella species. (a) Inspect figure 19.1 and construct a similar lineage for Salmonella. (b) What criteria do you think were used to make these taxonomic changes?
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Students have asked these similar questions
a.) which two of the following three species are more closely related: Entamoeba histolytica, Escherichia coli, Entamoeba coli? Explain.
b.) two organisms are in the same order but not in the same family. From this information, can you determine whether they are in the same class? Explain.
1) Which of the following apply(ies) to Bacillus cereus and Bacillus anthracis? Choose all that apply:
a) B. anthracis forms spores while B. cereus does not
b) B. cereus is more lethal when it causes an infection
c) B. anthracis has extra-chromosomal DNA that makes it more pathogenic
d) Despite their similar names, the two are actually not at all related
e) The 16S rRNA gene sequences of these bacteria are more than 99% identical, meaning that they are actually members of the same species
CASE #2
A 25-year-old Peace Corps worker has just returned from service in Ethiopia. She experiences a
sudden onset of asthma-like symptoms. She has no previous history of asthma. An O & P (ova and
parasites) on her stool was part of the normal discharge physical, considering the area of
assignment, before being released from the Peace Corps. The sample was processed according to
standard laboratory procedures. Two suspicious structures were noted during the direct saline wet
preparation. The first of the two structures is noted in form
# 1; it measures 50 x 40 um. The second structure is depicted in form #2 and measures 18 um in
diameter.
Form 1
Form 2
1.
Which of the structures is (are) considered a pathogenic parasite(s)?
Do the presenting symptoms relate to the O & P findings? If so, explain.
Look at the structure depicted in form #1. What key characteristics allow you to identify the
organism? Name the organism and its stage.
2.
3.
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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