Laboratory Experiments in Microbiology (11th Edition)
11th Edition
ISBN: 9780321994936
Author: Ted R. Johnson, Christine L. Case
Publisher: PEARSON
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Textbook Question
Chapter 21, Problem 1CT
Bacteria are the second most common cause of artificial implant failures in humans. In these cases, why isn’t an infection usually detected from cultures of blood or tissue?
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A suspected pathogen is observed from the blood of a diseased mouse. An
investigation of the other mice in the area indicates that it is not present in healthy
mice. With Koch's postulates in mind, what is the next step to determine whether or
not this suspected pathogen is the cause of disease in the mouse?
a) Grow the suspected pathogen in a pure culture
Ob) Re-isolate the suspected pathogen and show that it is the same as the
original pathogen
c) Inoculate a healthy mouse with the suspected pathogen
O d) Determine whether the organism in the pure culture is the same one as in
the original sample
Which one of the following is not
correct? *
a) Biocompatibility is the ability of a
material to perform within an appropriate
host response.
b) Bioactivity is the characteristic that
not allows the material to form a bond
with living tissue
c) Biodegradability is the breakdown of
O the implant due to chemical or cellular
interaction.
O d) all of above
Identifying an unknown bacterium is an essential step in the diagnosis and treatment process. Since not every antibiotic is effective against every type of bacteria, knowing what caused a particular infection allows us to make correct prescriptions so patients can recover more quickly. Knowing the cause of an infection also prevents antibiotic resistance as well, since incorrect prescriptions allow bacteria to be unnecessarily be exposed to antibiotics, increasing the chances of developing resistance.
Chapter 21 Solutions
Laboratory Experiments in Microbiology (11th Edition)
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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
- Note that it is not appropriate to self-diagnose outside of a medical context and this is a completely hypothetical scenario. Imagine you have a rash on your foot. You're concerned that it's an infection and inoculate a sample onto an agar plate. You wonder, How can I figure out whether the pathogen is a bacterium vs a eukaryote? You decide to use lab supplies to get a basic understanding of the pathogen. Be specific about what tests you use and what you expect the results to be. Limit yourself to experiments we could do in our lab. What is one experiment you could do, involving culturing the organism?arrow_forwardNote that it is not appropriate to self-diagnose outside of a medical context and this is a completely hypothetical scenario. Imagine you have a rash on your foot. You're concerned that it's an infection and inoculate a sample onto an agar plate. You wonder, How can I figure out whether the pathogen is a bacterium vs a eukaryote? You decide to use lab supplies to get a basic understanding of the pathogen. Be specific about what tests you use and what you expect the results to be. Limit yourself to experiments we could do in our lab. What is a procedure you could do, involving making a slide of the organism?arrow_forwardWhich of the following is true of commensal bacterium? Question 2 options: A) commensal bacteria do not receive any benefit from its host B) commensal bacteria only colonize adult hosts C) commensal bacterium may also be an opportunistic pathogen D) commensal bacterium cannot cause an infection its hostarrow_forward
- Why must the top agar be supplemented with maltose? A) Maltose allows for binding of the phage to the E. Coli and aids in the infection process B) Maltose helps stabilize the phage within the mediaarrow_forwardWhich one of the following categories for antibacterial agents is most likely to have toxic side effects for humans? a) disruptors of cell membrane structure b) inhibitors of cell wall synthesis Oc) inhibitors of protein synthesis d) antimetabolites RESET e) inhibitors of DNA synthesis Cancel Donearrow_forwardThere are fewer antifungal, anti protozoal, and antihelminth drugs compared to antibacterial drugs because these organism: a) do not cause many human infectious b) are not affected by antimicrobial drugs c) are so similar to human cells that drug selective toxicity is difficult d) are parasites found inside human cells e) have fewer target sites compared to bacteriaarrow_forward
- 1) What is NDM-1? How can NDM-1 spread to different types of bacteria? 2) Why are Gram negative bacteria so much harder to treat with antibiotics? 3) What is KPC? Where does it live?arrow_forwardAll the following would be of benefit to extracellular pathogens, except A) O the presence of a capsule B) O ability to prevent the fusion of a phagosome and lysosome C) O ability to prevent of opsonization D) O ability to alter cell surface proteins via phase variation E) O There are no exceptions; all are of benefit to extracellular pathogens.arrow_forwardWhich of the following is a consideration in treating bacterial infections A) Bacteriostatic b) bactericidal c) broad spectrumarrow_forward
- Our environment contains masses of microorganisms, many of which reside as commensal organisms on our body’s mucosal and epithelial surfaces without causing disease. What two features distinguish a pathogenic microbe from these commensal microbes?arrow_forward7) Identify the most correct choice: a) The time required for a bacterial population to double is called generation time Ob) Nitrogen is required by the organisms mainly to produce ATP. c) Agar is a common food source for the bacteria. d) A colony is usually a mixture of various bacterial organisms. e) a and carrow_forwardA nurse is caring for a patient who is receiving intravenous (IV) therapy. Which action is essential for preventing infection? a) Changing the IV tubing every 24 hours b) Using sterile technique during IV insertion c) Monitoring the IV site for signs of infection d) Administering IV medications as prescribedarrow_forward
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