PRESCOTT'S MICROBIO W/PROCTORIO
11th Edition
ISBN: 9781264731060
Author: WILLEY
Publisher: MCG
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Textbook Question
Chapter 19.6, Problem 2CC
Describe two different situations in which it would be essential to identify the genus and species of a bacterium or archaeon.
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The process of collecting characteristics of your unknown bacterium can be helped by the use of a dichotomous key. A dichotomous key is a flowchart that can be used to identify an organism.
a) in your own words explain how to create and use a dichotomous key to identify unknown bacteria
The techniques for identifying unknown bacteria can be summarized in three key steps, explain in your own words how to:
Staining the unknown for initial characterization by microscopy.
Using a dichotomous key strategy to systematically rule out other organisms.
Testing the organism for key biochemical traits.
For 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?
Chapter 19 Solutions
PRESCOTT'S MICROBIO W/PROCTORIO
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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- Present the ecology of Sphaerotilus natan or area where you can isolate the bacteria or the usual habitat. What are the Sphaerotilus natan related species? (Genera, etc).arrow_forwardYou work in a microbiology lab has been assigned to make routine identifications of Citrobacter freundii, Lactobacillus casei,Pseudomonas fluorescens, and Staphylococcus epidermidis. Using the dichotomous keys write up a lab protocol that everyone in your lab can use to identify these four organisms from the samples that your lab will receive. Create a Dichotomous Key(s) and an explanation.arrow_forwardWhy are macroscopic methods such as motility agar and colonial morphologic examination useful for classifying bacteria?arrow_forward
- Complete the colony morphology for the colonies pictured above: 1. Form - 2. Elevation - 3. Margin - 4. Surface - 5. Chromogenesis -arrow_forwardWhich of the following is a correct way to write a bacterial name? O 1) Escherichia coli O 2) Staphylococcus Aureus O 3) STAPHYLOCOCCUS EPIDERMIDIS O 4) bacillus Subtilis O 5) pseudomonas aeruginosaarrow_forwardThere are five major clades of bacteria. List three of them and provide their general characteristics and at least one example for each group.arrow_forward
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