32. The CRISPR-Cas system helps some prokaryotes defend against the phage! Which of thefollowing statements correctly describes how this system works?A) it produces RNA that is translated into proteins that attack viral DNA.B) it inserts specific genes randomly into the prokaryotic genome) it causes the synthesis of proteins that are then secreted by the prokaryote that attack virusesin the environment.D) it cuts viral DNA at specific sequences before it can replicate.

CRISPER stands for clustered regularly interspaced short palindromic repeats the enzyme used is…

Answered: 32. The CRISPR-Cas system helps some…

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter21: Viruses

Section: Chapter Questions

Problem 34CTQ: A botanist notices that a tomato plant looks diseased. How could the botanist confirm that the agent...

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(74) Isolates of Corynebacterium diphtheriae cause disease only if they carry a lysogenic bacteriophage encoding diphtheria toxin. Which of the following mechanisms results in the acquisition of this virulence factor? (A) Frame Shift Mutation (B) Reassortment (C) Transduction (D) Transformation (E) Transposon-induced mutation
What is unique about Z-DNA that might make it a specific target during viral infection?
What evolutionary advantage would a retrovirus gain by having the ability to regulate the sites of splicing of its RNA?
Although many +ssRNA viruses use their genomr directly as mRNA retroviruses do not. instead their +RNA is transcribed into a DNA by a resverse transcriptase. what advantages do retroviruses gained by using reserve transcriptase?
One of the reasons why phage therapy has not been applied widely is that bacteria can become resistant to bacteriophages as well, through mutations in genes encoding for specific proteins. What would be a protein in the bacterial cell that, if mutated, would make that cell resistant to phage infection?
What enzyme is responsible for the production of viral DNA from a retrovirus?
27. Match the following three words to its correct definition. a.) Transformation b.) Transduction c.) Conjugation -Uptake of DNA from the environment -Transfer of DNA by one bacterium to another by a viral vector -Transfer of replicated DNA from a donor to a recipient
What does the acronym CRISPR stand for? Briefly outline the components of the CRISPR/Cas system. What is the function of the CRISPR/Cas system?What do you think about the ethical impacts of a technology such as CRISPR? What is the main parameter that is used to define new virus families among archaeal viruses? List and outline that various stages through which bacteria and archaea fight back against infection with viruses.
Most humans are not easily infected by avian influenza. How, then, do DNA sequences from avian influenza become incorporated into human influenza?
What is the significance of the length of a typical viral genome?
Which of the following statements regarding transduction is FALSE? A) transduction reduces genetic variation within bacterial populations B) the inadvertent packaging of bacterial DNA into a phage particle can lead to generalized transduction C) specialized transduction can only be facilitated by a phage capable of integration into the bacterial genome D) generalized transduction involves the transfer of DNA that is exclusively bacterial E) specialized transduction must be preceded by viral integration and imperfect excision F) specialized transduction involves the transfer of both bacterial and viral DNA
1. List and describe the 6 steps in the replication of T4 phage in E. coli

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