Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Chapter 19, Problem 5TYU
Summary Introduction
Introduction: Viruses are infectious acellular microorganisms that have the key components such as
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Which of the following processes occurs in both lytic and nonlytic viral infections?(i) Infected cell ruptures to release viral particles.(ii) Viral mRNAs are transcribed by the host-cell translation machinery.(iii) Viral proteins and nucleic acids are packaged to produce virions.
Which statement is true of viral replication?
A) virus attaches to a specific receptor site on the host-cell membrane. B) Once inside the cell, the viral capsid is degraded, and the viral nucleic acid is released. C) Virus uses the host cell’s machinery to replicate and new virus particles are released. D) All of the above
The second step in viral replication is entry. For bacteriophage, entry usually
involves:
O a) direct entry of the nucleic acid into the cell.
Ob) phagocytosis.
c) membrane fusion mechanism of entry.
d) receptor-mediated endocytosis.
Chapter 19 Solutions
Campbell Biology
Ch. 19.1 - Prob. 1CCCh. 19.1 - Prob. 2CCCh. 19.2 - Compare the effect on the host cell of a lytic...Ch. 19.2 - MAKE CONNECTIONS Compare the CRISPR-Cas system to...Ch. 19.2 - Prob. 3CCCh. 19.2 - Why is HIV called a retrovirus?Ch. 19.2 - Prob. 5CCCh. 19.3 - Describe two ways in which a preexisting virus can...Ch. 19.3 - Contrast horizontal and vertical transmission of...Ch. 19.3 - WHAT IF? TMV has been isolated from virtually all...
Ch. 19 - Are viruses generally considered living or...Ch. 19 - Prob. 19.2CRCh. 19 - Prob. 19.3CRCh. 19 - Which of the following characteristics,...Ch. 19 - Emerging viruses arise by (A) mutation of existing...Ch. 19 - Prob. 3TYUCh. 19 - Prob. 4TYUCh. 19 - Prob. 5TYUCh. 19 - DRAW IT Redraw Figure 19.8 to show the replicative...Ch. 19 - EVOLUTION CONNECTION The successof some viruses...Ch. 19 - SCIENTIFIC INQUIRY When bacteria infect an animal,...Ch. 19 - WRITE ABOUT A THEME: ORGANIZATION While viruses...Ch. 19 - Prob. 10TYU
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- A particular animal virus requires the use of DNA polymerase from its host, since it does not possess its own DNA polymerase enzyme. Which of the following assumptions in A-D would likely be correct regarding this virus? A) O This virus could not be a retrovirus type. B) OIt could be a (-) ss RNA virus. C) O It could be a (+) ss RNA virus. D) O The vVirus life cycle very likely includes going to the host cell nucleus. E) O All ofA-D are correct assumptions.arrow_forwardC) complex D) polyhedral 23. The first step in viral infection is the recognition between the virus and the host cell. Which of the following statements best describes how that occurs? A) The viral genome matches the host cell genome. B) Surface proteins on the virus are recognized by receptor proteins found in the plasma membrane of the host cell. C) The viral genome is recognized by the capsid that surrounds the host cell genome. D) The envelope on the virus is recognized by the host cell genome.arrow_forwardWhen a virus invades a living cell, its (———-)takes over the cells functions. (Fill in the dash) a.) spike b.) outer-coat c.) generic material d.) core e.) cytoplasmarrow_forward
- we can stop the biosynthesis stage of the viral life cycle (not the stages before it) by preventing/inhibiting: A) fusion of the envelope and the plasma membrane B) replication and expression of viral nucleic acid/genome C) the virus's attachment molecules from binding to the host cell receptor D) new copies of viral nucleic acid from combining with newly made viral proteins E)buddingarrow_forwardDecreasing the amount of cytokine produced by the body would most directly prevent what event during the progression of COVID-19 in its host? A). Early viral infection of host cells. B). Replication of infected cells. C). Excessive damage to lung cells by the hot immune system. D). Transmission of the virus from one host to another.arrow_forwardAntigenic shifts in influenza viruses are represented by dra-matic changes in the viral antigens. It is likely they arise fromrare events in which:(a) Two different influenza viruses infect a cell at the sametime(b) Two separate viruses undergo lysogenic conversion(c) Two viruses conjugate(d) Mutations accumulate(e) All of the abovearrow_forward
- A virus replicates itself by attaching itself to a: a.) tissue b.) cell C.) organ d.) organismarrow_forwardWhich of the following viral components must get into a cell's cytoplasm in order for the virus to be replicated? A) Protein spikes B) The virus envelope C) The virus genome D) The virus capsidarrow_forwardEukaryotic viruses a.) Can attach to LPS to promote viral entry b.) Can replicate in the host cell nucleus c.) Can inject their genome into the eukaryotic nucleus d.)Do not utilize host ribosomes for protein synthesis e.) Do not utilize host polymerases for genome replicationarrow_forward
- Enveloped viral membranes are generally ________ with associated virus-specific ________. A) lipid bilayers / phospholipids B) protein bilayers / lipids C) lipid bilayers / proteins D) glycolipid bilayers / phospholipidsarrow_forward1. Precise words:Find the nonspecific terms in the following sentences. Replace the nonspecific choices with more preciseterms or phrases (It is not necessary to change the sentence structure).(i) All OVE mutants showed enhanced iP concentrations.(ii) Plants were kept in the cold overnight.(iii) To provide proof of concept for our hypothesis, we studied a virus in its host cell.(iv) The present paper reports on continuing experiments that were performed to clarify thissurprising effect.(v) The first transition state is a little lower in energy than the second transition state. 2. Simple words:Improve the word choice in the following examples by replacing the underlined terms or phrases withsimpler word choices (do not change the sentence structure).(i) These data substantiate our hypothesis.(ii) The difference in our results compared to those of Reuter et al. (1995) can be accounted forby the fact that different conditions were used.(iii) For the purpose of discussing cell migration we…arrow_forwardSynthesis of new bacteriophages in a bacterial host involves the use of a.) Host cell encoded proteins only b.)Virally encoded proteins only c.) Both host and virally encoded proteinsarrow_forward
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