PRESCOTT'S MICROBIO W/PROCTORIO
PRESCOTT'S MICROBIO W/PROCTORIO
11th Edition
ISBN: 9781264731060
Author: WILLEY
Publisher: MCG
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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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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.

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PRESCOTT'S MICROBIO W/PROCTORIO

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