Microbiology: An Introduction
12th Edition
ISBN: 9780321929150
Author: Gerard J. Tortora, Berdell R. Funke, Christine L. Case
Publisher: PEARSON
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Textbook Question
Chapter 15, Problem 10MCQ
Which of the following statements is true?
- a. The primary goal of a pathogen is to kill its host.
- b. Evolution selects for the most virulent pathogens.
- c. A successful pathogen doesn’t kill its host before it is transmitted.
- d. A successful pathogen never kills its host.
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A number of mosquito populations are today resistant to DDT, even though those species were not resistant to DDT when it was first introduced. Biologists would explain that DDT resistance evolved in mosquitos because: A. A few mosquitos were probably resistant to DDT before it was ever used. B. Mosquitos learned to adapt to their environment. C. Individual mosquitos built up an immunity to DDT after being exposed to it. D. Mosquitos needed to be resistant to DDT in order to survive.
Which of the following is a reason that scientists do not classify viruses as living things?
A. They must infect a host because they cannot reproduce on their own.
B. They contain DNA, like all living organisms.
C. The experience evolution through natural selection.
D. They replicate themselves and reproduce
Can viruses adapt by natural selection?
A. No, because there isn't a genetic basis for inheritance between parent and offspring virus particles.
B. No, because there isn't a way to distinguish more fit from less fit virus particles
C. Yes but only via human (domestic/artificial) selection
D. No they evolve by mutations.
E. Yes, virus particles that are most successful successful in reproducing quickly and infecting other host cells are the best adapted.
Chapter 15 Solutions
Microbiology: An Introduction
Ch. 15 - Compare pathogenicity with virulence.Ch. 15 - How are capsules and cell wall components related...Ch. 15 - Prob. 3RCh. 15 - Explain how drugs that bind each of the following...Ch. 15 - Prob. 5RCh. 15 - Prob. 6RCh. 15 - Prob. 7RCh. 15 - Which of the following genera is the most...Ch. 15 - How can viruses and protozoa avoid being killed by...Ch. 15 - Prob. 10R
Ch. 15 - The removal of plasmids reduces virulence in which...Ch. 15 - Prob. 2MCQCh. 15 - Prob. 3MCQCh. 15 - All of the following can occur during bacterial...Ch. 15 - The ID50 for Campylobacter sp. is 500 cells; the...Ch. 15 - Prob. 6MCQCh. 15 - A drug that binds to mannose on human cells would...Ch. 15 - The earliest smallpox vaccines were infected...Ch. 15 - Prob. 9MCQCh. 15 - Which of the following statements is true? a. The...Ch. 15 - Prob. 1ACh. 15 - Prob. 3ACh. 15 - How do each of the following strategies contribute...Ch. 15 - On July 8, a woman was given an antibiotic for...Ch. 15 - Explain whether each of the following examples is...Ch. 15 - Cancer patients undergoing chemotherapy are...
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