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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After attachment and entry, the next step of viral lifecycle is to
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D. release new virions
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
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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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- 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_forwardAt which stage of viral infection did these mutations most likely occur? a.) Attachment b.) Entry c.) Uncoating d.) Protein syntheis e.) Genome replicaton f.) Assembly g.) Exitarrow_forwardThe viral ________ plays a role in attaching a virion to the host cell. a. core b. capsid C. envelope d. both b and carrow_forward
- Which of the following happens to the viral nucleic acid during a lysogenic cycle cycle? a-the viral DNA immediately takes over the host cell genetic material b-it bursts the host cell c-the viral DNA forms a provirus d-the viral DNA is used to attach the bacteriophage to the host cell`s receptorsarrow_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_forwardWhich of the following are activities that a virus particle (a virion) cannot accomplish by itself? Select all that apply. a) Extract energy from food molecules b) Synthesis of capsid proteins c) Generate ATP d) Binding to a host cell e) Replication of the viral genomearrow_forward
- During viral infection, attachment is usually specific to a particular celltype becausea. the virus is attracted to the appropriate host cells by proteinssecreted into the extracellular fluid.b. the virus recognizes and binds to specific molecules in thecytoplasm of the host cell.c. the virus recognizes and binds to specific molecules on the surfaceof the host cell.d. the host cell produces channel proteins that provide passageways forviruses to enter the cytoplasm.e. the virus releases specific proteins that make holes in the membranelarge enough for the virus to enter.arrow_forwardWhich of the following events occurs in the lytic cycle of bacteriophage T4 infection but NOT in the lysogenic cycle? a.both digestion of host DNA and viral proteins synthesis b.attachment c.viral protein synthesis d.digestion of host DNA e.entryarrow_forwardDescribe the steps in a typical viral reproductive cycle, and explain how some viruses become latent.arrow_forward
- At which stage in viral replication does the genetic information enter the host cell? a. Penetration c. Assembly b. Synthesis d. Releasearrow_forwardCompare and contrast the entry step of the viral reproductive cycleof phage λ and HIV.arrow_forwardtwo directly trasmitted viral diseases have the same basic reproduction number (R0 - R not) even though their dynamics are different. Which of the following differences between the two diseases could lead to the same basic reproduction number? a. one disease has a higher transmission rate and a longer recovery period than the other b. one disease has a lower transmission rate and a longer recovery period than the other c. one disease has a lower transmission rate and a shorter recovery period than the other d. for one disease, the recovert period is long; for the other, no one recoversarrow_forward
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