Microbiology: An Introduction
11th Edition
ISBN: 9780321733603
Author: Gerard J. Tortora, Berdell R. Funke, Christine L. Case
Publisher: Benjamin Cummings
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
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 _______.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Which one of the following methods of antimicrobial susceptibility testing combines some
of the properties of two other methods and involves adding a plastic strip to the agar?
Select one:
a. Agar macrodilution method
b. Gradient diffusion method
c. Broth microdilution method
d. Disk diffusion method
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
O d. No growth next to the antibiotic disk
Clear my choice
Next page
A 1.5-year-old child developed vomiting, diarrhea, and fever. Stool sample were inoculated into the Endo media. After 18 hours on the surface of the medium grew medium-sized, round, slightly convex red colonies with a metallic luster. The doctor suspected Escherichia coli.
1. Name the composition of the Endo agar media.
2. Describe the properties of bacterial colonies on the Endo media.
3. What purpose differential diagnostic Endo media used for?
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
Additional Science Textbook Solutions
Find more solutions based on key concepts
3. CAUTION Why is genetic drift aptly named?
a. It causes allele frequencies to drift up or down randomly.
b. I...
Biological Science (6th Edition)
Define histology.
Fundamentals of Anatomy & Physiology (11th Edition)
explain the function of fermentation and the conditions under which it occurs?
Biology: Life on Earth with Physiology (11th Edition)
All of the following processes are involved in the carbon cycle except: a. photosynthesis b. cell respiration c...
Human Biology: Concepts and Current Issues
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- 3- Visible Growth in Tubes Growth in Petri Dishes 0 µg/ml 2 µg/ml 0 1 3 4 ÖÖÖÖÖÖÖÖ 2 5 6 7 number 1, and After addition of The figure given above summarizes an experiment carried out to test the efficacy of an antimicrobial substance. In the tube number 0, no antimicrobial substance was added into bacterial culture. 2 µg/ml of antimicrobial substance was added into tube the amount of antimicrobial was doubled for each consecutive tube. antimicrobial into tubes, tubes were incubated for overnight and after incubation tubes were observed for growth. The growth status of bacteria in each tube was shown as (+) and (-). In addition to observation of visible growth, 1 ml of sample from each tube was collected and plated into petri dishes and incubated for additional overnight. Similarly, the growth status in petri dishes was as (+) and (-). According to given information; a. Determine the minimum inhibitory concentration (MIC). b. Determine the minimum bactericidal concentration (MBC). c.…arrow_forwardI AM TRYING TO IDENTIFY THIS UNKNOWN. ***IMAGE 1 HAS TWO PICTURE OF CATALASE TEST AND BLOOD AGAR TEST. ***IMAGE 2 HAS TWO TESTS CONDUCTED ON IT, BACITRACIN AND PYR I believe it is one of the following: 1) S. pyo. 2)S. agal . 3)S.pneu. 4)E. faecalis 5)S. aureus 6)S epi. 7)S. sapro. 8)M. luteus Please let me know which one of the above is thge unknown. You have pictures of the unkown on Catalase and Blood Agar and three test conducted on Bacitracin and PYR. Give reasoning as why you think it will be one of the above. Explaing the characteristics and what made you deicide it?arrow_forwarddiameter AM=47MM TE= 27 MM both left hand side is ampicillin and right hand side is tetracycline With reference to the table below, determine the antibiotic susceptibilities of different antibiotics against coli and S.aureus. S.aureus Antimicrobial agent Interpretive categories and zone diameter breakpoints, nearest whole mm sensitive Intermediate resistant Tetracycline >19 15-18 <14arrow_forward
- ulase d. Summerase Will also be positive for 13. Which of the following sugars are NOT used in TSI media? a. Fructose b. Sucrose c. Dextrose d. Lactose 14. An organism which is positive for the CAMP test must be a(n) a. Group A Streptococci b. Staphylococci c. Group B Streptococci d. Enterococci ben ben lyttem 15. The indole test is done to see if a microorganism can hydrolyze a. Urea b. Tryptophan c. Starch d. Lipids to eradiem vhinebi dan di beau al la >2 19rito yns noril relast wobiseid setu ovisis BUO 6. You inoculate an unknown Streptococcal species into 6.5% sodiu and it grows! This means you must havearrow_forwardThe following methods used for sterilizing an antibiotic solution. i. Dry heat sterilization ii. Microfiltration iii. Autoclaving iv. Desiccation Select one: O a. i and ii O b. i and iii O c. ii and iv O d. ii onlyarrow_forward10. Which one of the following methods of antimicrobial susceptibility testing combines some of the properties of two other methods and involves adding a plastic strip to the agar? a. Gradient diffusion method b. Agar macrodilution method c. Disk diffusion method d. Broth microdilution method 11. Most ATP molecules are produced during which phase of aerobia respiration? a. Fermentation b. Krebs cycle c. Glycolysis d. Electron transport chain 12. The goal of disinfection is to eliminate ____ whereas the goal of sterile technique is to exclude ____ a. bacteria , bacteria and viruses b. pathogens, all microorganisms c. nonpathogenspathogens d. all microorganisms, pathogens 13. Which one of the following statements about archaea is false? Select one: a. The cell walls of archaea contain a thicker layer of peptidoglycan than the cell walls of bacteria. b. Some archaea live in extremely hot environments. c. Archaea are more closely related to eukaryotes than they are to bacteria. d.…arrow_forward
- 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 c. Strip C with MIC at 0.075 μg/mL d. All of the strips show equal antimicrobial efficacyarrow_forwardDescribe characteristics of Streptococcus Agalactiae in the Agar: (How does colonies look like (color) and explain does it grow on that agar. Blood Agar (Aerobic) MacConkey EMB PEA Mannitol Salt Agar Chocolate Agar Nutient Agararrow_forwardNeutralization of residual disinfectant could be made by: a. Dilution if the concentration exponent is high b. Dilution if the concentration exponent is low c. Adding specific agent e.g. 3% Tween 80 d. Either a or c e. Either b or carrow_forward
- Your colleague has given you an unauthenticated cell culture grown from a primary explant. Suggest for screening the fresh cell culture you've received, with a focus on mycoplasma contamination screening, are welcome. Include in the proposal all feasible cell culture conditions.arrow_forwardI. Match the bacterium being described in column X with its best classification found in column Y. Choose the best answer. Column X1. Staphylococcus aureus can be grown on mannitol salt agar that contains 7.5% NaCl. The bacterium is________. 2. Lactobacillus acidophilus grows best at pH 4.5. It is considered a(n) ________. Column Y A. acidophile B. alkalophile C. barophile 3. A bacterium that thrives in the Great Salt Lake but not in fresh water is probably a ________.4. Bacteria isolated from the bottom of the ocean need high atmospheric pressures to survive. They are________.5. A bacterium that thrives in a soda lake where the average pH is 10.5 can be classified as a(n) ________. D. halotolerant E. halophilearrow_forwardChoose one specific way from each of the two methods of inhibiting the growth of microbes below. Describe the method, explain the mechanism of action of killing the microorganisms and give practical applications of your chosen ways. 1. Physical Methods - Heat, cold, dessication, radiation, ultrasonic waves, filtration, gaseous atmosphere 2. Chemical Methods- disinfectants, antisepticsarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Human Anatomy & Physiology (11th Edition)BiologyISBN:9780134580999Author:Elaine N. Marieb, Katja N. HoehnPublisher:PEARSON
Biology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStax
Anatomy & PhysiologyBiologyISBN:9781259398629Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa StouterPublisher:Mcgraw Hill Education,
Molecular Biology of the Cell (Sixth Edition)BiologyISBN:9780815344322Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter WalterPublisher:W. W. Norton & Company
Laboratory Manual For Human Anatomy & PhysiologyBiologyISBN:9781260159363Author:Martin, Terry R., Prentice-craver, CynthiaPublisher:McGraw-Hill Publishing Co.
Inquiry Into Life (16th Edition)BiologyISBN:9781260231700Author:Sylvia S. Mader, Michael WindelspechtPublisher:McGraw Hill Education
Human Anatomy & Physiology (11th Edition)
Biology
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:PEARSON
Biology 2e
Biology
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:OpenStax
Anatomy & Physiology
Biology
ISBN:9781259398629
Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa Stouter
Publisher:Mcgraw Hill Education,
Molecular Biology of the Cell (Sixth Edition)
Biology
ISBN:9780815344322
Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter Walter
Publisher:W. W. Norton & Company
Laboratory Manual For Human Anatomy & Physiology
Biology
ISBN:9781260159363
Author:Martin, Terry R., Prentice-craver, Cynthia
Publisher:McGraw-Hill Publishing Co.
Inquiry Into Life (16th Edition)
Biology
ISBN:9781260231700
Author:Sylvia S. Mader, Michael Windelspecht
Publisher:McGraw Hill Education
cell culture and growth media for Microbiology; Author: Scientist Cindy;https://www.youtube.com/watch?v=EjnQ3peWRek;License: Standard YouTube License, CC-BY