Microbiology Fundamentals: A Clinical Approach
3rd Edition
ISBN: 9781259709227
Author: Marjorie Kelly Cowan Professor, Heidi Smith
Publisher: McGraw-Hill Education
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Chapter 10, Problem 11Q
You take a sample from a growth-free portion of the zone of inhibition in the Kirby-Bauer test and inoculate it onto a plate of nonselective medium. What does it mean if growth occurs on the new plate?
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A pure culture was inoculated onto a Mueller-Hinton agar plate. The Kirby-Bauer procedure was performed. One of the drugs tested showed a large zone of inhibition but also had small colonies growing within this zone. Further testing showed that these colonies were not the results of contamination. Why would these colonies be present within this zone of inhibition?
If you have a culture with 1 x 106 cells per ml, how could you use serial dilutions to obtain a suspension with 5 x 102 cells per ml? Show your answer using a serial dilution scheme or diagram
Assume you have a stock culture at 5 x 109 cells/mL and you wish to inoculate 1 liter of fresh medium so that in 15 hours the cell density will be 2 x 108/mL. Assume a generation time of 3.5 hours. What should be the dilution?
Chapter 10 Solutions
Microbiology Fundamentals: A Clinical Approach
Ch. 10.1 - State the main goal of antimicrobial treatment.Ch. 10.1 - Identify the sources for the most commonly used...Ch. 10.1 - Describe two methods for testing antimicrobial...Ch. 10.1 - Prob. 4AYPCh. 10.1 - NCLEX PREP 1. An RN is caring for a 26-year-old...Ch. 10.2 - Explain the concept of selective toxicity.Ch. 10.2 - List the five major targets of antimicrobial...Ch. 10.2 - Prob. 7AYPCh. 10.2 - Distinguish between broad-spectrum and...Ch. 10.2 - Prob. 9AYP
Ch. 10.2 - Explain the mode of action of penicillinases and...Ch. 10.2 - Identify two antimicrobials that act by inhibiting...Ch. 10.2 - Prob. 12AYPCh. 10.2 - Identify one example of a fluoroquinolone.Ch. 10.2 - Describe the mode of action of drugs that target...Ch. 10.2 - Prob. 15AYPCh. 10.2 - Prob. 16AYPCh. 10.2 - Explain why antiprotozoal and antihelminthic drugs...Ch. 10.2 - List the three major targets of action of...Ch. 10.2 - Prob. 2NPCh. 10.3 - Discuss two main ways that microbes acquire...Ch. 10.3 - List five cellular or structural mechanisms that...Ch. 10.3 - Prob. 21AYPCh. 10.3 - Prob. 3NPCh. 10.3 - Prob. 1MMCh. 10.4 - Distinguish between drug toxicity and allergic...Ch. 10.4 - Prob. 23AYPCh. 10.4 - Prob. 4NPCh. 10.4 - Prob. 5NPCh. 10 - Microbial resistance to drugs is acquired through...Ch. 10 - Prob. 2QCh. 10 - Prob. 3QCh. 10 - Prob. 4QCh. 10 - Why does the penicillin group of antibiotics have...Ch. 10 - Prob. 6QCh. 10 - Prob. 7QCh. 10 - Conduct research to find out why drugs blocking...Ch. 10 - Prob. 9QCh. 10 - Prob. 10QCh. 10 - You take a sample from a growth-free portion of...Ch. 10 - Prob. 12QCh. 10 - Treating malarial infections is theoretically...Ch. 10 - Can you think of a situation in which it would be...Ch. 10 - Prob. 15QCh. 10 - Prob. 16QCh. 10 - Prob. 17QCh. 10 - Prob. 18QCh. 10 - An antimicrobial drug with a _______ therapeutic...Ch. 10 - Prob. 20QCh. 10 - Prob. 21QCh. 10 - Prob. 1VC
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- After quick-characterization by staining, specialized growth media can be used to indicate further biochemical characteristics of an unknown organism. These tests use visual outcomes, such as colors, patterns, and changes in appearance. The results can be interpreted to then assign a characteristic to the unknown organism. For example, a color change may happen when an unknown organism is incubated in a mixed sugar broth. The color could indicate which sugar was (or was not) used by the bacterium for energy. a) explain in your own words how to perform specialized media tests to find an unknown bacteriaarrow_forwardAssume that you are adding 300 microliters of 1% substrate solution per well in a 24-well plate. If we can order 5 milligrams of fibronectin for $871.00, how much would it cost to have enough to use every well of the 24-well culture plate?arrow_forwardStarting with 10 bacterial cells per milliliter in a sufficient amount of complete culture medium with a 1-hour lag phase and a 30-minute generation time, how many cells will there be in a liter of medium at the end of 2 hours? At the end of 7 hours? Show your solution.arrow_forward
- You have a starter culture containing 8 x 109 cells per mL, from which you take 10mL to inoculate a fresh 1 L culture. After 15 hours, the cell density of the new culture is 3 x 1012cells per mL. What are the generation time and the mean growth rate constant of theorganism in culture?arrow_forwardYou aseptically transfer 1 mL of your original liquid culture into 99 mL of sterile water. What is the dilution factor?arrow_forwardYour instructor asks you to isolate and identify the organisms in an unknown culture. You find that the culture contains two gramnegative bacilli that produce swarming colonies. What biochemical test would you use to identify the bacilli? Justify your answer.arrow_forward
- On agar plate does each discrete colony represent the growth of one cell? Explain your answer. Why can a single colony on a plate be used to start a pure culture?arrow_forwardYou aseptically transfer 1ml of your original liquid culture into 999 ml of sterile water. What is the dilution factor?arrow_forwardWhat is the advantage of the plating method over an electronic cell counting method in counting cells? Why does turbidity lose reliability at high cell concentrations when the culture reaches the stationary phase?arrow_forward
- You just finished plating your electroporatio products on your YPD-Zeocin plate and you think you did everything perfectly but you come back the folloeing week and have zero colonies. Which of the following could be the reason for the absence of colonies? A) You centrifuged your electroporated cells for 30 sec at 16,000 rpm instead of 4,000 rpm before plating them B) You added sorbitol+YPD to your cells thirty minutes after pulsing your cells C) The Zeocin had not been added to the plates when they were made. D) All of the above E) Both a and b onlyarrow_forwardOn which of the following types of media would you expect untransformed bacteria to grow on? LB agar LB agar with ampicillin Untransformed bacteria will not grow on any type of medium. Untransformed bacteria will grow on all three types of media. LB agar with ampicillin and arabinosearrow_forwardIf 0.1 ml of a 1 * 10−6 dilution plate contains 56 colonies, calculate thenumber of cells per ml of the original culturearrow_forward
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cell culture and growth media for Microbiology; Author: Scientist Cindy;https://www.youtube.com/watch?v=EjnQ3peWRek;License: Standard YouTube License, CC-BY