Genetics: Analysis and Principles
6th Edition
ISBN: 9781259616020
Author: Robert J. Brooker Professor Dr.
Publisher: McGraw-Hill Education
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Chapter 18.2, Problem 1COMQ
Summary Introduction
Introduction:
Viruses are small opportunistic organisms that require host cells for replication and carrying out their lifecycle. They are considered non-living organisms because without a living host cell they cannot grow, develop, reproduce, and are also unable to use energy for their
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Which of the following is a common order of the steps in a viralreproductive cycle? (Note: Integration is an optional step.)a. Entry, integration, attachment, synthesis of viral components,viral assembly, viral releaseb. Entry, integration, synthesis of viral components, viralassembly,attachment, viral releasec. Attachment, entry, integration, synthesis of viral components,viral assembly, viral released. Attachment, entry, integration, viral assembly, synthesis ofviral components, viral release
After attachment and entry, the next step of viral lifecycle is to
A.translate viral proteins
B. assembly new viral particles
C. replicate the genome
D. release new virions
Arrange the following list into the correct sequence for viral reproduction: 1. penetration 2. assembly 3. replication 4. attachment 5. release (a) 1, 2, 3, 4, 5 (b) 5, 2, 3, 4, 1 (c) 4, 1, 3, 2, 5 (d) 4, 1, 2, 3, 5 (e) 3, 1, 2, 4, 5
Chapter 18 Solutions
Genetics: Analysis and Principles
Ch. 18.1 - 1. What is a common feature found in all viruses?...Ch. 18.1 - 2. Viral genomes can be
a. DNA or RNA.
b....Ch. 18.2 - Prob. 1COMQCh. 18.2 - Prob. 2COMQCh. 18.3 - A mutation in phage results in 10-fold greater...Ch. 18.3 - 2. The cl gene that encodes the λ repressor has...Ch. 18.4 - A viral protein that is needed to make HIV DNA is...Ch. 18.4 - Prob. 2COMQCh. 18.4 - After HIV components are made, what is the correct...Ch. 18 - 1. Discuss why viruses are considered nonliving.
Ch. 18 - What structural features are common to all...Ch. 18 - 3. What are the similarities and differences among...Ch. 18 - Prob. 4CONQCh. 18 - Prob. 5CONQCh. 18 - Prob. 6CONQCh. 18 - Prob. 7CONQCh. 18 - Prob. 8CONQCh. 18 - Prob. 9CONQCh. 18 - Prob. 10CONQCh. 18 - 11. What is a prophage, a provirus, and an...Ch. 18 - Prob. 12CONQCh. 18 - Prob. 13CONQCh. 18 - 14. With regard to promoting the lytic or...Ch. 18 - 15. How do therepressor and the cro protein affect...Ch. 18 - Prob. 16CONQCh. 18 - Figure 18.11 shows a genetic switch that controls...Ch. 18 - Prob. 18CONQCh. 18 - Prob. 19CONQCh. 18 - Explain the role of RNase H (a component of...Ch. 18 - Prob. 21CONQCh. 18 - Prob. 22CONQCh. 18 - Prob. 23CONQCh. 18 - 24. Compare and contrast the roles of fully...Ch. 18 - 25. Describe the role of the Gag polyprotein...Ch. 18 - Prob. 26CONQCh. 18 - Prob. 27CONQCh. 18 - 1. Discuss how researchers determined that TMV is...Ch. 18 - Prob. 2EQCh. 18 - What is a reconstituted virus?Ch. 18 - Following the infection of healthy tobacco leaves...Ch. 18 - Prob. 5EQCh. 18 - Prob. 6EQCh. 18 - A researcher identified a mutation in PR of phage ...Ch. 18 - Experimentally, when an E. coli bacterium already...Ch. 18 - 9. A bacterium is exposed to a drug that inhibits...Ch. 18 - This question combines your knowledge of bacterial...Ch. 18 - Prob. 1QSDCCh. 18 - 2. Certain environmental conditions such as...Ch. 18 - 3. Browse the Internet to determine the drugs that...
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- To infect their specific host cells, viruses go through these chronological steps EXCEPT a. Release of progeny viruses b. Absorption and penetration of the viral particles c. Uncoating of the nucleic acid of the viral particles d. Synthesis and assembly of viral particle componentsarrow_forward(i) Describe each way viruses may be classified. And Define each of the following parts of a virus, their composition/structure, and explain their role in the viral life cycle: a. Capsid b. Capsomere c. Nucleocapsid d. Envelope e. Spikesarrow_forward(i) Describe each way viruses may be classified. And Define each of the following parts of a virus, their composition/structure, and explain their role in the viral life cycle: a. Capsid b. Capsomere c. Nucleocapsid d. Envelope e. Spikes (typed format not handwritten) thanksarrow_forward
- a. Which type of viruses can be directly used for translation? a) dsRNA b) Positive ssRNA c) Retroviruses d) Negative ssRNA b. An antiviral drug specifically modifies viral receptors on a eukaryotic host cell. How might this affect the viral reproductive cycle? It would enhance the process of viral apoptosis It would result in the degeneration of the viral capsid It would facilitate the process of viral endocytosis It would prevent the virus from attaching to the host cellarrow_forwardCapsid proteins are synthesized during which phase of viral replication? a. replication d. proteination c. assembly b. biosynthesis e. All of these are correct.arrow_forwardWhich of the following statements are correct for RNA viruses? Mark all that apply. A.Replication requires reverse transcriptase B. Uncoating must occur for the virus to be replicated C.The genome consists of two identical strands of ssRNA D.Replication requires RNA dependent RNA polymerase E. The viral DNA acts as a template for production of viral proteins F.Protease enzyme is required for biosynthesis and maturation of virions G. A provirus stage occurs during viral replicationarrow_forward
- a. How are viral envelopes formed? Why are enveloped viruses that infect plants and bacteria rare? b. Outline the life cycle options of a temperate phage upon entering a host cell. c. Consider the 5 steps of a virus life cycle. List three structures and/or processes that are unique to viruses and would make good drug targets for an antiviral agent. Explain your rationale for each choice.arrow_forwardWhich of the following statements are correct for DNA viruses? Mark all that apply. A.The genome consists of dsRNA B. A provirus stage occurs during viral replication C. The genome consists of two identical strands of DNA D. Replication requires reverse transcriptase Replication requires DNA polymerase E.The viral DNA must enter the nucleus for its replication F. Uncoating must occur for the virus to be replicated G.The viral genome acts as a template for production of viral proteinsarrow_forwardPlease explain briefly the steps involved in the viral multiplication cycle. How is each step important? Please explain the difference between virus and bacteriophage multiplication.arrow_forward
- Match the best possible fit for the following Animal virus replication stages. A. Attachment B. Uncoating C. Release select 1. Virus binds to specific or non-specific cell receptors. select - 2. Enzymes degrade the viral capsid select - 3. Budding processes and transport vesicles are crucial for this stage.arrow_forwardChoose the best below ? Capsid proteins are synthesized during which phase of viralreplication? a. replication d. proteinationb. biosynthesis e. All of these are correct.c. assemblyarrow_forwardArrange the following list into the correct sequence for part of the cycle of a retrovirus: 1. dsDNA integrated into host DNA 2.viral proteins synthesized on host ribosomes 3. viral DNA uses host enzymes to transcribe viral RNA 4. reverse transcriptase catalyzes synthesis of ssDNA 5. synthesis of second DNA strand (a) 5, 2, 1, 3, 4 (b) 5, 2, 3, 4, 1 (c) 4, 5, 1, 3, 2 (d) 4, 1, 2, 3, 5 (e) 2, 1, 3, 4, 5arrow_forward
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