Brock Biology of Microorganisms (15th Edition)
15th Edition
ISBN: 9780134261928
Author: Michael T. Madigan, Kelly S. Bender, Daniel H. Buckley, W. Matthew Sattley, David A. Stahl
Publisher: PEARSON
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Chapter 28.4, Problem 1MQ
- Describe the disc diffusion test and the Etest for antimicrobial susceptibility. For an individual organism and an antimicrobial agent, what do the results signify?
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The diagram below illustrates a quorum sensing pathway from Staphylococcus aureus. Please answer the following questions.
1. Autoinduction is part of the quorum sensing system. Which promoter (P2 or P3) is critical for autoinduction?
2)This staphylococcus aureus grows on human wounds, causing severe infections. You would like to start a clinical trial to treat these wound infections. Please describe:
a) What molecule do you recommend for the trial. Why?
b) Your trial requires that Staphylococcus aureus be isolated from the wound and submitted to genome sequencing before admittance. Why? What are you testing for?
3) If a mutation arises where the Promoter P3 is constitutively active, how would that influence sensitivity to AIP? Please explain your rationale.
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Mutation 1
Mutation 2
There is currently a H5N1 cattle outbreak in North America.
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You have a bacterial strain with the CMU operon:
a) As shown in the image below, the cmu operon encodes a peptide (Pep1), as well as a
kinase and regulator corresponding to a two-component system. The cmu operon is
activated when Pep 1 is added to the growth media.
Pep1 is a peptide that when added extracellularly leads to activation of the Cmu operon.
Pep1 cmu-kinase cmu-regulator
You also have these genetic components in other strains:
b) An alternative sigma factor, with a promoter activated by the cmu-regulator, that control a
series of multiple operons that together encode a transformasome (cellular machinery
for transformation).
c) the gene cl (a repressor).
d) the promoter X, which includes a cl binding site (and in the absence of cl is active).
e) the gene gp (encoding a green fluorescence protein).
Using the cmu operon as a starting point, and assuming you can perform cloning to rearrange
any of these genomic features, how would you use one or more of these to modify the…
Chapter 28 Solutions
Brock Biology of Microorganisms (15th Edition)
Ch. 28.1 - The use of personal protective equipment (PPE) is...Ch. 28.1 - Identify and discuss the standard safety...Ch. 28.1 - Prob. 1CRCh. 28.2 - Prob. 1MQCh. 28.2 - How can the spread of HAIs be controlled?Ch. 28.2 - Prob. 1CRCh. 28.3 - What are the key points necessary for proper...Ch. 28.3 - Identify culture methods and conditions used for...Ch. 28.3 - QWhy is it important to process clinical specimens...Ch. 28.4 - Describe the disc diffusion test and the Etest for...
Ch. 28.4 - What is the value of antimicrobial drug...Ch. 28.4 - QDescribe the disc diffusion test for antibiotic...Ch. 28.5 - Explain the reasons for changes in antibody titer...Ch. 28.5 - Describe the method, time frame, and rationale for...Ch. 28.5 - What advantages do monoclonal antibodies have...Ch. 28.5 - QWhy does antibody titer rise after infection? Is...Ch. 28.6 - How is the bivalence of antibodies significant for...Ch. 28.6 - What are the advantages and disadvantages of...Ch. 28.6 - Why are agglutination tests so widely used in...Ch. 28.7 - Prob. 1MQCh. 28.7 - Compare the advantages and disadvantages of EIA,...Ch. 28.7 - Prob. 1CRCh. 28.8 - What advantage(s) does nucleic acid amplification...Ch. 28.8 - How do quantitative PCR (qPCR) and qualitative PCR...Ch. 28.8 - Distinguish between quantitative and qualitative...Ch. 28.9 - Compare and contrast live attenuated vaccines,...Ch. 28.9 - Identify the advantages of alternative...Ch. 28.9 - QList the immunizations recommended for children...Ch. 28.10 - Prob. 1MQCh. 28.10 - How does the activity of each antibiotic class...Ch. 28.10 - What are the sources of aminoglycosides,...Ch. 28.10 - Antibiotics are chemically diverse antimicrobial...Ch. 28.11 - What steps in the viral maturation process are...Ch. 28.11 - Why are there fewer clinically effective...Ch. 28.11 - Why is host toxicity a common problem with...Ch. 28.12 - Identify the basic mechanisms of antibiotic...Ch. 28.12 - What does vancomycin have in common with...Ch. 28.12 - Prob. 3MQCh. 28.12 - What practices contribute to the spread of...Ch. 28 - Define the procedures you would use to isolate and...Ch. 28 - Prob. 2AQCh. 28 - Describe three important reasons why semisynthetic...Ch. 28 - Imagine yourself as a clinical microbiologist with...
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- You have identified a new species of a Gram-positive bacteria. You would like to screen their genome for all proteins that are covalently linked to the cell wall. You have annotated the genome, so that you identified all the promoters, operons, and genes sequences within the operons. Using these features, what would you screen for to identify a set of candidates for proteins covalently linked to the bacterial cell wall.arrow_forwardBelow is a diagram from a genomic locus of a bacterial genome. Each arrow represents a coding region, and the arrowheads indicate its orientation in the genome. The numbers are randomly assigned. Draw the following features on the diagram, and explain your rationale for each feature: 10 12 合會會會會長 6 a) Expected transcriptions, based on known properties of bacterial genes and operons. How many proteins are encoded in each of the transcripts? b) Location of promoters (include rationale) c) Location of transcriptional terminators (include rationale) d) Locations of Shine-Dalgarno sequences (include rationale)arrow_forwardSample excuse letter in school class for the reasons of headaches and dysmenorrhea caused by menstrual cyclearrow_forward
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