Prescott's Microbiology
11th Edition
ISBN: 9781260211887
Author: WILLEY, Sandman, Wood
Publisher: McGraw Hill
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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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why would it be necessary to complete identification of a bacterium based on it physiology rather than on its morphology
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
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 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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- 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.arrow_forwardDescribe how specimen collection is performed using aseptic techniques to isolate medically significant bacteria and identify these clinically important bacterial species, Escherichia coli, Streptococcus pneumonia, Haemophilus influenzae and Streptococcus pyogenes by using different staining techniques and biochemical tests. Evaluate the effectiveness of different biochemical techniques used to identify different bacterial species.arrow_forwardThere are different types of bacteria classify them based on following: i. Shapes ii. gram stain iii. oxygen demand iv. mode of nutritionarrow_forward
- A) A short paragraph on the habitat of the organism. B) A short paragraph on the special characteristics of the organism. C) And a short paragraph on the clinical significance of the organism. The bacterial organism is Pseudomonas aeruginosaarrow_forwardWhat is the correct way to write this microbe’s name: bacillus subtilis, Bacillus subtilis, Bacillus Subtilis, or Bacillus subtilis? Identify the genus name and the species epithet.arrow_forwardWrite a paragraph for when you once have Neisseria gonorrhoea bacteria in its pure form, what methods can you use to confirm the identity of this bacterium as N. gonorrhoeae? Mention what is the principle of those methods.arrow_forward
- Describe the shape and color of the following species of bacteria after Acid-Fast staining: E. coli S. aureus M. luteus P. aeruginosa M. tuberculosisarrow_forwardThe Gram staining technique is useful to classify Bacteria. Can the technique be applied to Archaea? Discuss briefly.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_forward
- 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_forwardAntonie van Leeuwenhoek was the first person to use a microscope and describe tiny animalcules. What is an animalcule? Describe major characteristics of an animalcule in terms of microbiology. Describe the size and living state of these animalcules. Please include: How are animalcules classified/identified? How do you form these classification groups? Edit View Insert Format Tools Table 12pt ✓ Paragraph B IU А VT² V ⠀arrow_forwardWhy are macroscopic methods such as motility agar and colonial morphologic examination useful for classifying bacteria?arrow_forward
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