Microbiology: A Systems Approach
Microbiology: A Systems Approach
5th Edition
ISBN: 9781259706615
Author: Marjorie Kelly Cowan Professor
Publisher: McGraw-Hill Education
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Chapter 6, Problem 1MCQ

A virus is a tiny infectious

  1. a. cell.
  2. b. living thing.
  3. c. particle.
  4. d. nucleic acid.
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Summary Introduction

Introduction:

Viruses are the small infectious particle that causes severe or mild infections in humans, plants, and animals. Viruses are not alive when they are present outside the host body. They need a host to reproduce or replicate. A virus contains a capsid (coat protein), nucleic acid, and an envelope (lipid membrane)

Answer to Problem 1MCQ

Correct answer:

A virus is a tiny microscopic infectious particle. Therefore, option (c) is correct.

Option (c) is given as “particle”.

Explanation of Solution

Justify reason for the correct statement:

Viruses are the lifeless molecule and unable to multiply independently from the host cell. They are not living, but when they are present in a host they possess certain processes of the living organismbut do not exhibit most of the processes. Therefore, viruses can be better described as the infectious particles rather than organisms.

Hence, option (c) is correct.

Justify reasons for the incorrect statements:

Option (a) is given as “cell”.

Viruses are not made of cells. Hence, it is a wrong answer.

Option (b) is given as “living thing”.

Viruses are not living things because they are unable to multiply or grow in number independently from the host cell. Hence, it is a wrong answer.

Option (d) is given as “nucleic acid”.

Viruses do contain a nucleic acid, but they cannot be defined as an infectious nucleic acid because it is one of a component of a virus. Hence, it is a wrong answer.

Hence, options (a),(b), and(d) are incorrect.

Conclusion

Hence, viruses can be defined as the tiny infectious particles.

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Chapter 6 Solutions

Microbiology: A Systems Approach

Ch. 6.4 - Demonstrate how family and genus names in viruses...Ch. 6.5 - Diagram the six-step life cycle of animal viruses.Ch. 6.5 - Define the term cytopathic effect and provide one...Ch. 6.5 - Provide examples of persistent and transforming...Ch. 6.5 - Provide a thorough description of lysogenic and...Ch. 6.6 - List the three principal purposes for cultivating...Ch. 6.6 - Describe three ways in which viruses are...Ch. 6.7 - Prob. 18AYPCh. 6.8 - Analyze the relative importance of viruses in...Ch. 6.8 - Prob. 20AYPCh. 6 - A virus is a tiny infectious a. cell. b. living...Ch. 6 - Viruses are known to infect a. plants. b....Ch. 6 - The nucleic acid of a virus is a. DNA only. b. RNA...Ch. 6 - The general steps in a viral multiplication cycle...Ch. 6 - Prob. 5MCQCh. 6 - In general, RNA viruses multiply in the cell ____,...Ch. 6 - Viruses cannot be cultivated in/on a. tissue...Ch. 6 - Clear patches in cell cultures that indicate sites...Ch. 6 - Label the parts of this virus. Identify the...Ch. 6 - Circle the viral infections from this list:...Ch. 6 - In lysogeny, viral DNA is inserted into the host...Ch. 6 - A viral capsid is composed of subunits called...Ch. 6 - The envelope of an animal virus is derived from...Ch. 6 - The nucleic acid of animal viruses enters the cell...Ch. 6 - Viruses that persist in the (host) cell and cause...Ch. 6 - Provide evidence in support of or refuting the...Ch. 6 - Summarize the unique properties of viruses and...Ch. 6 - Prob. 3CTQCh. 6 - Compare and contrast the processes of latency and...Ch. 6 - Use the Internet to search prion diseases, and...Ch. 6 - From chapter 2, figure 2.23: A virus containing...Ch. 6 - Prob. 1CM
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