Microbiology: An Introduction
12th Edition
ISBN: 9780321929150
Author: Gerard J. Tortora, Berdell R. Funke, Christine L. Case
Publisher: PEARSON
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Chapter 20, Problem 6A
The following results were obtained from a broth dilution test for microbial susceptibility.
| Antibiotic Concentration | Growth | Growth in Subculture |
| 200 µg/ml | - | - |
| 100 µg/ml | - | + |
| 50 µg/ml | + | + |
| 25 µg/ml | + | + |
a. The MIC of this antibiotic is _______.
b. The MBC of this antibiotic is _______.
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What results on a microdilution antimicrobial susceptibility test would indicate an
antibiotic would be an effective treatment for an infection?
O a. Growth next to the antibiotic
O b. High optical density in the well with inoculum and antibiotic
O c. Low optical density in the well with inoculum and antibiotic
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Which among the group would be affected when excessive Zn++ is present in the medium? Provide two (2) corrective actions to resolve this error.
1.
a. Disk A
b. Disk B
c. Disk C
d. Disk D
2.
a. Strip A with MIC at 0.25 μg/mL
b. Strip B with MIC at 0.064 μg/mL
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d. All of the strips show equal antimicrobial efficacy
Chapter 20 Solutions
Microbiology: An Introduction
Ch. 20 - DRAW IT Show where the following antibiotics work:...Ch. 20 - List and explain five criteria used to identify an...Ch. 20 - What similar problems are encountered with...Ch. 20 - Define drug resistance. How is it produced? What...Ch. 20 - List the advantages of using two chemotherapeutic...Ch. 20 - Why does a cell die from the following...Ch. 20 - How does each of the following inhibit...Ch. 20 - The OH is missing from carbon 39 in ddI. How does...Ch. 20 - Compare the method of action of the following...Ch. 20 - NAME IT This microorganism is not susceptible to...
Ch. 20 - Which of the following pairs is mismatched? a....Ch. 20 - Prob. 2MCQCh. 20 - Prob. 3MCQCh. 20 - An antimicrobial agent should meet all of the...Ch. 20 - The most selective antimicrobial activity would be...Ch. 20 - Prob. 6MCQCh. 20 - Which of the following will not affect eukaryotic...Ch. 20 - Cell membrane damage causes death because a. the...Ch. 20 - A drug that intercalates into DNA has the...Ch. 20 - Chloramphenicol binds to the 50S portion of a...Ch. 20 - Prob. 1ACh. 20 - Why is idoxuridine effective if host cells also...Ch. 20 - Some bacteria become resistant to tetracycline...Ch. 20 - The following data were obtained from a...Ch. 20 - Prob. 5ACh. 20 - The following results were obtained from a broth...Ch. 20 - Vancomycin-resistant Enterococcus faecalis was...Ch. 20 - Prob. 2CAECh. 20 - Prob. 3CAE
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