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Appendix D
SCI/250 Version 3
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University of Phoenix Material
Appendix D - Viruses
Review Chapter 10 of Microbiology: Principles and Exploration and the following Virus Animation
to help you complete the matrix below.
http://higheredbcs.wiley.com/legacy/college/black/0471420840/animations/ch10/ch10_Viruses/ind
ex.html
Review Figure 10.1 of Microbiology: Principles and Explorations. Determine what the functions of
the following components are:
Component
Function
Capsid
Envelope
Nucleic acid
Spikes (glycoproteins)
Respond to Critical Thinking Question 1 in Ch. 10 of Microbiology: Principles and Explorations in
the space that follows.
The extreme simplicity of viruses eliminates most of the vulnerable features found in cellular
organisms such as bacteria. Antibacterial products commonly attack cell walls, plasma
membranes, and cytoplasm, none of which are present in viruses.
Using two or three sentences, explain in your own words how viruses are classified by type of
nucleic acid, capsid shape, and presence of envelope.
Explanation
Nucleic acid
Capsid shape
Presence of envelope
Review Ch. 10 of Microbiology: Principles and Explorations. Briefly describe each of the stages
of viral reproduction.
Stage
Description
Absorption
Penetration
Synthesis
Maturation
Release
Looking at the five steps in viral replication, can you identify some promising ways to prevent or
control viral infections?
Would you classify viruses as living, nonliving, or semiliving? Explain your answer.
.
Review Table 10.7 of Microbiology: Principles and Explorations. Define the following types of
viruses and viruslike agents.
Virus/Viruslike agent
Definition
Satellites
Viroids
Prions
Respond to the following questions in the space that follows. Can viruses cause cancer? Does it
matter if the virus is composed of DNA or RNA? Explain your answers.
Appendix D
SCI/250 Version 3
©2008 University of Phoenix. All rights reserved.
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