Genetics: Analysis and Principles
6th Edition
ISBN: 9781259616020
Author: Robert J. Brooker Professor Dr.
Publisher: McGraw-Hill Education
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Chapter 18, Problem 7CONQ
Summary Introduction
To review:
The differences and comparison between entry step in the reproductive cycle of HIV (human immunodeficiency virus) and phage λ (Lambda).
Introduction:
Virus lies in the category of non-living entitiesascannot carry out their own reproduction. They can only produce more of their own kind by depending on the cellular machinery of host cells. The reproductive cycle of a majority of virusesconsists offive to six common steps. These are attachment, entry, integration, synthesis of the components of the virus, assembly of the virus, and its release.
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Students have asked these similar questions
Compare and contrast the entry step of the viral reproductive cycleof phage λ and HIV.
During the lysogenic cycle of lambda (1) phage
the phage genome is integrated in the host chromosome where it is passed on to daughter cells through binary fission.
the phage DNA is copied and accumulates in the cytoplasm. Then a trigger causes capsid proteins to be made and phages are assembled.
the product of one prophage gene is made and it activates most of the other prophage genes.
the viral genes immediately turn the host cell into a lambda-producing factory. Then the host lyses.
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Please explain briefly the steps involved in the viral multiplication cycle. How is each step important? Please explain the difference between virus and bacteriophage multiplication.
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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- Draw a diagram of the one-step growth curve ofvirus replication, and briefly explain why the growthcurve differs from a typical bacterial growth curve.arrow_forwardDescribe why the attachment step in a viral reproductive cycle isusually specific for one or just a few cell types.arrow_forwardCompare and contrast the lysogenic and lytic cycles of phage λ.arrow_forward
- Define latency, and explain how it occurs for phage λ and HIV.arrow_forwardCompare and contrast the mechanism of replication of T4 vs. filamentous phages.arrow_forwardbriefly describe four explanations why E. coli phages can only infect E. coli cells, but not other bacteria or human cells.arrow_forward
- Compare and contrast the reproductive cycles of phage λ and HIV.arrow_forwardExplain the role of RNase H (a component of reverse transcriptase)during the synthesis of HIV DNA.arrow_forwardDescribe the reason behind the occurrence of phage growth and release by the mating with the non-lysogenic recipient, but not with the infection by a lysogenic recipient.arrow_forward
- What advantages might a phage gain by being capable of lysogeny?arrow_forwardWhy is a webbed plate capable of producing a higher lysate titer (pfu/mL) than a cleared plate? a.) A webbed plate has plaques that have gone through more rounds of replication because the number of host cells did not limit phage replication, creating exponentially more phage particles b.) A webbed plate has no more host available for replication, meaning the plate is full of exponentially higher amounts of phage c.) A cleared plate has less bacteria than a webbed plate, so there are more plaques present d.) A cleared plate contains more phage than a webbed plate because it started with a more concentrated phage samplearrow_forwardIndicate whether each statement applies to the lytic or lysogenic cycle of phage A, or to both. 1. The host cell is lysed. (Click to select) v 2. The genetic material of the phage is copied. (Click to select) v 3. The genetic material of the phage is integrated into the bacterium's chromosome. (Click to select) v 4. Two ends of the phage DNA become covalently attached to one another. (Click to select) v 5. The integrase gene is turned on.: (Click to select) v (Click to select) lytic lysogenic botharrow_forward
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