Microbiology: An Introduction
11th Edition
ISBN: 9780321733603
Author: Gerard J. Tortora, Berdell R. Funke, Christine L. Case
Publisher: Benjamin Cummings
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Textbook Question
Chapter 13, Problem 7R
Why is it difficult to determine the etiology of
a viral infection, such as influenza?
b. cancer?
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Students have asked these similar questions
a. During which stages of an infectious disease does the host exhibit signs and symptoms? Is there a
correlation between this and when a disease is communicable?
b. Why are some viral diseases, like smallpox and polio, no longer seen in the United States? Why are
many bacterial disease, like syphilis, no longer a death sentence? Think about how these two types
of microbes infect humans. Why might we make an effort to treat viral diseases before infection but
continue to treat bacterial diseases after infection?
c. Based on the graph below, which pathogen is more virulent: Agent 1 or Agent 2? Explain.
100
Agent 1
LD5 = 400,
Agent 2
LD50 = 600
25
100
200
300
400
500
600
700
800
900
1,000
Dose (organisms administered per animal)
Percent mortality
75
What are the immune responses to viral infections? What is the difference between epidemic and pandemic? The “Spanish Flu” in 1918 was caused by the H1N1 influenza virus. What do the “H” and “N” stand for?
a. Since viruses lack metabolic enzymes, how can they synthesize necessary components? b. Name some enzymes that viruses may have for invading and completing their cycles.
Chapter 13 Solutions
Microbiology: An Introduction
Ch. 13 - Why do we classify viruses as obligatory...Ch. 13 - List the four properties that define a virus, what...Ch. 13 - Describe the four morphological classes of...Ch. 13 - DRAW IT Label the principal events of attachment,...Ch. 13 - Compare biosynthesis of a + stranded RNA and a ...Ch. 13 - Prob. 6RCh. 13 - Why is it difficult to determine the etiology of a...Ch. 13 - Prob. 8RCh. 13 - Plant viruses can be cultured in (c) __________.Ch. 13 - NAME IT Identify the viral family that infects...
Ch. 13 - Discuss the arguments for and against the...Ch. 13 - In some viruses, capsomeres function as enzymes as...Ch. 13 - Why was the discovery of simian AIDS and feline...Ch. 13 - Prophages and proviruses have been described as...Ch. 13 - Prob. 1MCQCh. 13 - The molecule serving as mRNA can be incorporated...Ch. 13 - Prob. 3MCQCh. 13 - Prob. 4MCQCh. 13 - An example of lysogeny in animals could be a. slow...Ch. 13 - The ability of a virus to infect an organism is...Ch. 13 - Which of the following statements is false? a....Ch. 13 - Prob. 8MCQCh. 13 - Prob. 9MCQCh. 13 - Prob. 10MCQCh. 13 - Prob. 1CAECh. 13 - A newborn female developed extensive vesicular and...Ch. 13 - Prob. 3CAE
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