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 28.10, Problem 1CR
Antibiotics are chemically diverse antimicrobial compounds produced by microorganisms. Each antibiotic works by inhibiting a specific cellular process in the target microorganisms. The β-lactam antibiotics, including penicillins and cephalosporins, target bacterial cell wall synthesis and are the most important class of clinical antibiotics. The aminoglycosides, macrolides, and tetracycline antibiotics selectively interfere with protein synthesis in Bacteria. The quinolones are an important class of synthetic antibacterial drugs that inhibit DNA synthesis. Daptomycin and platensimycin are structurally novel antibiotics that target cytoplasmic membrane functions and lipid biosynthesis, respectively.
What are the common sources for natural antibiotics? How do these antimicrobial drugs differ from growth factor analogs, such as the sulfa drugs? Why are β-lactam antibiotics generally more effective against gram-positive bacteria than against gram-negative bacteria?
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Spectrum of activity describes how many species of microbes a drug works against. Broad-spectrum antibiotics are effective against many different groups of bacteria, while narrow-spectrum antibiotics work well against a particular group or species, but have little effect on the rest.
Based on our class results, which of the following are narrow-spectrum?
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The ribosome is the target for many important antibiotics. These drugs must discriminate between bacterial and eukaryotic ribosomes to achieve drug specificity and toxicity. For the two common antibiotics below, what is their mechanism of action and why are they more toxic to bacteria than eukaryotes?
a) Tetracycline
b) Erythromycin
Both ethanol and trimethyldodecylammonium chloride are active ingredients in cleaning products used to disinfect. Both will inactivate coronaviruses by a similar mechanism of action. Describe that mechanism of action and why both chemicals are able to cause it. (Reminder: coronaviruses are "lipid envelope" viruses.) Consider the physical properties of these compounds to answer the following question: why might you choose to use a cleaning product with one of these active ingredients over the other?
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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