BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
10th Edition
ISBN: 9781305967359
Author: STARR
Publisher: CENGAGE L
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Question
Chapter 19, Problem 1CT
Summary Introduction
To explain:
The characteristics in virus due to lack of an envelope.
Introduction:
A virus is defined as a noncellular infectious particle that replicates only inside a living cell. A viral particle is a virus that is not present inside a host cell. Viruses are divided into two types on the basis of presence of an envelope. Enveloped viruses are specifically surrounded by an outer lipid membrane. Lipid membrane is absent in nonenveloped viruses. The tobacco mosaic virus, Rhinoviruses, and the
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Rhinovirus, the most common cause of colds, do not have a lipid envelope. Compared to enveloped viruses these and other nonenveloped viruses tend to remain infectious outside the body longer, are more likely to be spread by contact with surfaces, and are likely to be rendered harmless by exposure to hand sanitizer or hand washing. Explain how the lack of an envelope could contribute to these characteristics.
Which of the following highly contagious viruses is a single-stranded ribonucleic acid (RNA) virus with a helical capsid and envelope and is transmitted by coming in contact with respiratory secretions?
"This is a highly contagious respiratory illness transmitted when an infected person coughs or sneezes virus particles into the air," the health department said in a written statement. "It's so contagious that if one person is sick and spreading measles, nine out of 10 people around them who aren't immune will get it, too."
Group of answer choices
a. Measles
b. Parvovirus
c. Coxsackie virus A
d. Rhinovirus
In electron micrographs of HSV infection, it can be seen that the intact virus initially reacts
with cell-surface proteoglycans, then with specific receptors. This is later followed by viral
capsids docking with nuclear pores. Afterward, the capsids go from being full to being
"empty." Which of the following statements best fits these observations?
The viral envelope is not required for infectivity, since the envelope does not enter the
nucleus.
The viral envelope mediates entry into the cell, the capsid mediates entry into the
nuclear membrane, and the genome is all that enters the nucleus.
Only the genetic material of the virus is involved in the cell's infectivity, and is injected
into the host cell like the genome of a phage.
Viral capsids are needed for the cell to become infected; since the full capsids enter the
nucleus.
Chapter 19 Solutions
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
Ch. 19 - ________ can have a genome of either RNA or DNA....Ch. 19 - Peptidoglycan is seen only in cell walls of...Ch. 19 - In _______, viral DNA becomes integrated into a...Ch. 19 - Prob. 4SACh. 19 - Prob. 5SACh. 19 - Prob. 6SACh. 19 - Prob. 7SACh. 19 - _______ are oxygen-releasing photoautotrophs. a....Ch. 19 - Prob. 9SACh. 19 - Vitamin-producing E. coli cells in your gut are...
Ch. 19 - Prob. 11SACh. 19 - Prob. 12SACh. 19 - Eukaryotes are most closely related to _______. a....Ch. 19 - Match each disease with the type of pathogen that...Ch. 19 - Prob. 15SACh. 19 - Prob. 1CTCh. 19 - Methanogens have been found in the human gut and...Ch. 19 - Review the description of Fred Griffiths...Ch. 19 - The antibiotic penicillin interferes with...Ch. 19 - Many compounds secreted by soil bacteria have been...
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