PRESCOTT'S MICROBIOLOGY
11th Edition
ISBN: 2818440045677
Author: WILLEY
Publisher: MCG
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Chapter 26, Problem 1AL
No temperate RNA phages have yet been discovered. How might this absence be explained?
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Chapter 26 Solutions
PRESCOTT'S MICROBIOLOGY
Ch. 26.1 - List some characteristics used in classifying...Ch. 26.1 - Prob. 2CCCh. 26.2 - Prob. 1MICh. 26.2 - Why do you think T4 evolved to initiate DNA...Ch. 26.2 - What function does HMC glycosylation serve?Ch. 26.2 - Explain why the T4 genome is circularly permuted.Ch. 26.2 - Prob. 1.2CCCh. 26.2 - How is a prophage induced to become active again?Ch. 26.2 - Describe the roles of cII, CIII, repressor (CI),...Ch. 26.2 - How do the temperate phages Mu and P1 differ from...
Ch. 26.2 - How is the envelope of this virus formed? How does...Ch. 26.2 - Why do cold sores recur throughout the lifetime of...Ch. 26.2 - In what part of the host cell does a herpesvirus...Ch. 26.2 - Many small DNA viruses rely on host enzymes for...Ch. 26.3 - Why is the X174 genome considered plus stranded?Ch. 26.3 - Why is it necessary for some ssDNA viruses to...Ch. 26.3 - Prob. 2CCCh. 26.3 - How do parvoviruses trick the host DNA polymerase...Ch. 26.4 - The rotavirus genome encodes 12 proteins. Suggest...Ch. 26.4 - Describe the life cycle of 6 phage. What makes...Ch. 26.4 - Prob. 3CCCh. 26.4 - In what ways are the life cycles of 6 and...Ch. 26.5 - Where in the host does the plus-strand RNA genome...Ch. 26.5 - How do some plus-strand viruses use polyproteins...Ch. 26.5 - What is an IRES? Why is it important?Ch. 26.5 - Prob. 3CCCh. 26.6 - How does that use of a segmented genome by...Ch. 26.6 - Prob. 2CCCh. 26.7 - Prob. 1MICh. 26.7 - Prob. 1CCCh. 26.7 - Prob. 2CCCh. 26.7 - Prob. 3CCCh. 26.8 - Prob. 1CCCh. 26.8 - Trace the HBV multiplication cycle, paying...Ch. 26 - Prob. 1RCCh. 26 - Prob. 2RCCh. 26 - Prob. 3RCCh. 26 - Prob. 4RCCh. 26 - No temperate RNA phages have yet been discovered....Ch. 26 - The choice between lysogeny and lysis is...Ch. 26 - Prob. 3ALCh. 26 - You are studying RNA viruses and have discovered a...Ch. 26 - Prob. 5ALCh. 26 - Prob. 6AL
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- Why can transfer of DNA by conjugation cross genus lines, whereas transfer of DNA by natural transformation or phage transduction is usually limited to a few closely related organisms?arrow_forwardScientists at the SEA Phages lab were asked to find a phage that might infect a strain of M. abscessus that is infecting a young patient. Because the scientists did not have any phages known to infect M. abscessus, they first tested M. smeg phages that are also known to infect M. tuberculosis to see if they could infect this specific strain of M. abscessus. Why did they start with those phages? Select the best answer. O Phages that infect M. tuberculosis will also infect M. abscessus O The phages have already been FDA approved for use in phage therapy O Phages that infect two different hosts have a broader host range and are more likely to be able to infect a third host (such as M. abcessus) O The phages are lytic, which makes them good candidates for phage therapy O More information is known about the genomes of these phages than other phagesarrow_forwardCan phages kill humans?arrow_forward
- According to Philip Bell’s viral eukaryogenesis hypothesis, genes for DNA replication, RNA transcription, protein translation, and histone proteins were all provided by: an endosymbiotic gram-negative eubacterium an endosymbiotic archaeobacterium a gram-positive eubacterial host cell a double-stranded DNA virus an archaeobacterial host cellarrow_forwardAre phages alive?arrow_forwardPlease help a bit confusedarrow_forward
- Bacterial conjugation has medical consequences. For example, certain plasmids contain genes that code for toxins. The causative agent of a deadly form of food poisoning, E. coli 0157, synthesizes a toxin that causes massive bloody diarrhea and kidney failure. This toxin is now believed to have originated in Shigella, another bacterium that causes dysentery. Similarly, the growing problem of antibiotic resistance is partly attributable to the spread of antibioticresistant genes among bacterial populations. Antibiotic resistance develops because antibiotics are overused in medical practice and in livestock feeds. Suggest a mechanism by which this extensive use promotes antibiotic resistance.arrow_forwardWhen bacteriophage P1 causes E. coli to lyse, the resulting materialis called a P1 lysate. What type of genetic material would befound in most of the P1 phages in the lysate? What kind of geneticmaterial is occasionally found within a P1 phage?arrow_forwardMost temperate phages integrate into the host chromosome, whereas some replicate as plasmids. Which kind of relationship would you think would be more likely to maintain the phage in the host cell? Why?arrow_forward
- The following are lambda phage gene deletions. What lambda lifestyle will result from each deletion? (The Greek letter delta Δ, when used in the name of a gene, stands for that gene deleted.) 1. ΔcII 2. Δcroarrow_forwardWhat is the function of the CRISPR/Cas system? What are the ethical impacts of a CRISPR? What is the main parameter that is used to define new virus families among archaeal viruses? Explain the stages through which bacteria and archaea fight back against infection with viruses.arrow_forwardThe Archaea is similar to the Eukarya in the following characteristic except? initiator 1RNA (protein synthesis) O 16S FRNA nucleotide sequence sensitivity to antibiotics types of RNA polymerase The Archaea differ from the Eubacteria in the following characteristic except: * O initiator tRNA (protein synthesis) origin of DNA replication sensitivity to antibiotics types of RNA polymerasearrow_forward
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