Prescott's Microbiology
11th Edition
ISBN: 9781260211887
Author: WILLEY, Sandman, Wood
Publisher: McGraw Hill
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Textbook Question
Chapter 26.4, Problem 2CC
Describe the life cycle of ϕ6 phage. What makes this phage unusual when compared with other bacteriophages?
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A bacteriophage λ is found that is able to lysogenize itsE. coli host at 30°C but not at 42°C. What genes may bemutant in this phage?
When 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?
Why does phage T4 need a lysozyme-like protein in order toinfect its host, and what part of T4 enters the host cytoplasm?
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 is E. coli LE392 a good host from the strain of lambda phage cI857?arrow_forwardWhat is the toxin produced by E. coli O157:H7 that was encode by phage as a consequence of lysogenic conversion? Explain the medical importance.arrow_forwardwhen various strains of lambda phage are seeded on a lawn of e.coli, they can form clear or turbid plaques. Explain the difference between the two types of plaques. can all bacteriophage form clear and turbid plaques?arrow_forward
- What structures on bacterial host cells serve to allow bacteriophage to recognize them? What component of these structures may be most readily recognizable to bacteriophages?arrow_forwardThe size of a DNA fragment that can be inserted into an unmodified λ vector is very limited. Large segment in the central region of the λ DNA molecule can be removed without affecting the ability of the phage to infect Escherichia coli cells. However, the deletion of this non- essential region does affect the life cycle of the bacteriophage. Explain this statement.arrow_forwardWhen various strains of λ phage are seeded on a lawn of E. coli, they can form clear or turbid plaques. (b) For mutant λ phages that can only form clear plaques, give two different types of mutation in the phage that can explain the clear plaque phenotype.arrow_forward
- What advantages might a phage gain by being capable of lysogeny?arrow_forwardDuring 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. 0000arrow_forwardLambda phage çan facilitate bacterial chemosomal DNA transfer through the process of specialized transduction / generalized transduction (copy and paste the correct answer) A by transferring specific bacterial DNA / bacterial DNA at random (copy and paste the correct answer) A from a donor cell / recipient cell (copy and paste the correct answer) A to a donor cell / recipient cell (copy and paste the correct answer).arrow_forward
- Which statement is true regarding a bacteriophage in the lysogenic cycle? 111 A) O The bacteriophage can exit the lysogenic state depending on the condition of host cell B) O While in this cycle, it would cause no harm to the host cell. O OAs the host cell divides, the bacteriophage genome will be present in all of the host cell's progeny. |D) OIt would become a prophage. E) O All are true statements.arrow_forwardFrom what other environments might E. coli bacteriophages be readily isolated?arrow_forwardFrom the perspective of a bacteriophage, what is the advantage of being able to follow either a lytic or a lysogenic cycle?arrow_forward
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