Microbiology Fundamentals: A Clinical Approach
3rd Edition
ISBN: 9781259709227
Author: Marjorie Kelly Cowan Professor, Heidi Smith
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 2, Problem 15Q
Archaea often grow naturally in extreme environments. Those called extreme thermophiles thrive in hot springs and in high-temperature hydrothermal vents in the ocean. Invent a culturing technique you could use that would be selective for these organisms.
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A budding artisanal cheesemaker is trying to establish her own starter culture, but there
is an archaeal contaminant she finds difficult to get rid of. Instead of producing lactic acid,
the Archaea ferments the milk sugars into alcohol, an extremely undesirable effect in
cheese making, therefore ruining many of her cheesemaking efforts.
She asked microbiologists for help to find a strategy that may hinder the growth or even
kill the archaeal cells, but not the lactic acid bacteria (LAB) in rest of her starter culture.
The microbiologists come up with different things to try. In the table below are some
strategies that she tries.
Practice Question Chapter 3
5. Predict what the results are going to be for each strategy she uses. Assume each
inhibitor is specific. Assume she doesn't know the species of Archaea that is
contaminating her starter culture.
Answer yes, no, or maybe where appropriate, explain your answer in the last row
of the table below.
Will stop cell
growth of
Archaea
Will…
You wish to know whether Archaea exist in a lake water sample but are unsuccessful in culturing any. Using techniques
described in this chapter, how could you determine whether Archaea exist in the sample, and if they do, what proportion
of the cells in the lake sample are Archaea?
Diseases that involve biofilm-producing bacteria are of serious concern. They are not as easily treated compared with those involving free-floating (or planktonic) bacteria. Explain three reasons why biofilms can be more pathogenic.
Chapter 2 Solutions
Microbiology Fundamentals: A Clinical Approach
Ch. 2.1 - Explain what the Five Is are and what each step...Ch. 2.1 - Discuss three physical states of media and when...Ch. 2.1 - Compare and contrast selective and differential...Ch. 2.1 - Provide brief definitions for defined media and...Ch. 2.1 - Medical Moment The Making of the Flu Vaccine: An...Ch. 2.1 - Prob. 1NPCh. 2.1 - Prob. 2NPCh. 2.2 - Prob. 5AYPCh. 2.2 - Prob. 6AYPCh. 2.2 - Prob. 7AYP
Ch. 2.2 - Give examples of simple, differential, and special...Ch. 2.2 - Prob. 3NPCh. 2.2 - Medical Moment Gram-Positive Versus Gram-Negative...Ch. 2 - The identities of microorganisms on our planet a....Ch. 2 - Prob. 2QCh. 2 - Often bacteria that are freshly isolated from a...Ch. 2 - Which of these types of organisms is least likely...Ch. 2 - Prob. 5QCh. 2 - Some bacteria can produce a structure called an...Ch. 2 - A fastidious organism must be grown on what type...Ch. 2 - Write a short paragraph to differentiate among the...Ch. 2 - Prob. 9QCh. 2 - Viruses are commonly grown in/on a. animal cells...Ch. 2 - Can you devise a growth medium with ingredients...Ch. 2 - There is a type of differential medium that can...Ch. 2 - Prob. 13QCh. 2 - Several bacteria live naturally in a material on...Ch. 2 - Archaea often grow naturally in extreme...Ch. 2 - Prob. 16QCh. 2 - After performing the streak plate procedure on a...Ch. 2 - You are a scientist studying a marsh area...Ch. 2 - Prob. 19QCh. 2 - Prob. 20QCh. 2 - You perform the special stain for bacterial...Ch. 2 - Prob. 1VC
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