Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 21, Problem
Figure 21.10 Which of the following statements is false?
- In the lytic cycle, new phages are produced and released into the environment.
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Which of the following statements describes the lysogenic cycle of lambda (A) phage?
After infection, the viral genes immediately turn the host cell into a lambda-producing factory, and the host
cell then lyses.
Most of the prophage genes are activated by the product of a particular prophage gene.
The phage DNA is incorporated into the bacteria DNA
The phage DNA is copied and exits the cell as a phage.
The phage DNA get destructed by the host bacteria DNA
You are studying your favorite (hypothetical) bacteriophage named M277. It infects E. coli and stays dormant within the bacterial cell.
How does a phage become dormant within a cell? Generally, describe the steps of infection by phage in this scenario
The figure depicts five stages of the lytic cycle.
*********
Select the statement that describes stage 3 of the lytic cycle,
as shown in the diagram.
The host cell synthesizes cellular proteins to prepare
for lysis.
The host cell incorporates phage DNA into its
own genome.
The host cell replicates the phage DNA.
O The host cell synthesizes proteins that degrade
phage DNA.
Chapter 21 Solutions
Biology 2e
Ch. 21 - Figure 21.5 Which of the following statements...Ch. 21 - Figure 21.8 Influenza virus is packaged in a viral...Ch. 21 - Figure 21.10 Which of the following statements is...Ch. 21 - Which statement is true? A virion contains DNA and...Ch. 21 - The viral______play(s) a role in attaching a...Ch. 21 - Viruses. all have a round shape cannot have a long...Ch. 21 - The observation that the bacteria genus Chlamydia...Ch. 21 - A scientist discovers a new virus with a linear,...Ch. 21 - Which statement is not true of viral replication?...Ch. 21 - Which statement is true of viral replication? In...
Ch. 21 - Which statement is true of reverse transcriptase?...Ch. 21 - Oncogenic virus cores can be. RNA DNA neither RNA...Ch. 21 - Which is true of DNA viruses? They use the host...Ch. 21 - A bacteriophage can infect the lungs viruses...Ch. 21 - People with the CCR5?32 mutation of a T-cell...Ch. 21 - An apple grower notices that several of his apple...Ch. 21 - Which of the following is NOT used to treat active...Ch. 21 - Vaccines. are similar to viroids are only needed...Ch. 21 - A patient presents at the clinic with an acute...Ch. 21 - Which of the following is not associated with...Ch. 21 - Which statement is true of viroids? They are...Ch. 21 - The first electron micrograph of a virus (tobacco...Ch. 21 - Varicella-zoster virus is a double-stranded DNA...Ch. 21 - Classify the Rabies virus (a rhabdovirus family...Ch. 21 - Why can’t dogs catch the measles?Ch. 21 - One of the first and most important targets for...Ch. 21 - In this section, you were introduced to different...Ch. 21 - Although plant viruses cannot infect humans, what...Ch. 21 - A bacteriophage with a lytic life cycle develops a...Ch. 21 - Why is immunization after being bitten by a rabid...Ch. 21 - The vaccine Gardasil that targets human papilloma...Ch. 21 - Prions are responsible for variant Creutzfeldt...Ch. 21 - How are viroids like viruses?Ch. 21 - A botanist notices that a tomato plant looks...
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- 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. 0000arrow_forwardA phage that reproduces slowly, produces relatively few phage particles, and only undergoes the lytic life cycle most likely will produce a plaque that is: Smaller and clear Smaller and turbid/hazy Larger and turbid/hazy Larger and cleararrow_forwardClassify each statement as true of generalized transduction or specialized transduction. Generalized transduction Specialized transduction Answer Bank Genes transfer from random sites in the bacterial chromosome. This utilizes lysogenic phages. Genes that transfer depend on the prophage insertion site. This utilizes lytic phages. Phage inserts itself at a specific site in the bacterial chromosome. This requires accidental packaging of bacterial DNA in viral capsids.arrow_forward
- This gene is responsible for making the protein that catalyzes the recombination of the phage genome into the host bacterial chromosome is: excise integrase attP attBarrow_forwardphage can be "induced" as a result of DNA damage. Consequences of induction include. Temperate phage, e.g lambda phage; lytic cycle and transduction Lytic T4 phage, assembly, conjugation O Lytic phage, e.g. T4 phage; lysogenic cycle, prophage formation Temperate phage, e.g. lambada phage, prophage formation, transformation O T4 phage, lytic cycle, specialized trasnductionarrow_forwardWhich of the following is true of Generalized transduction? O creates defective virions that are missing the entire phage genome phage and host DNA are both packed in the capsid by error Cha type of Hirgone transfer Frequency is I in 10¹ O occurs during the lysogenic cyclearrow_forward
- The lytic cycle of a bacteriophage can be characterized by A large number of phages are released at a time. The virus-host relationship usually lasts for generations. The viral genome replicates without destroying the host. Viral DNA is incorporated into the host genome.arrow_forwardDuring a lytic cycle, viral DNA replication occurs without phage production or the death of the cell while during the lysogenic cycle many copies of the phage are produced within the bacterial cell, the bacterium breaks open. Select one: True Falsearrow_forwardAn antimicrobial drug binds to the HIV reverse transcriptase enzyme, preventing it from working. Which of the following is true of this drug? It would inhibit early replication steps of some viruses, but not affect normal eukaryotic cell activity. It would directly interfere with translation of some viral proteins and some eukaryotic proteins. It would block assembly/maturation steps of some viruses, and interfere with translation in eukaryotic cells. It would interfere with release of newly formed viruses from a host cell, but not affect eukaryotic cells. It would interfere with protein synthesis in bacteria, but not affect eukaryotic ribosomes. It would interfere with mRNA transcription in bacteria and viruses, but not affect eukaryotic transcription.arrow_forward
- What is the difference between the lytic and lysogenic cycle of bacteriophages? In the lysogenic cycle, the phage DNA integrates itself into the host genome after penetration, and continues to biosynthesis when conditions change The host cell is not killed in the lysogenic cycle The lytic cycle occurs in the nucleus, while the lysogenic cycle occurs in the cytoplasm In the lysogenic cycle, penetration is achieved through phagocytosisarrow_forwardPut in the correct order the following steps of the lytic cycle in phage replication: 1. Phage components are assembled into mature virions 2. Phage attach to a host cell 3. The bacterial cell lyses and many new infectious virions are released 4. Phage DNA is injected into the bacterial cell 5. Copies of phage genome and phage proteins are made, the host DNA is degradedarrow_forwardIn the lytic cycle of a bacteriophage the host membrane ruptures, releasing many phages. the host sequesters viral particles in the lysosome. viral DNA incorporates into the host genome. the viral genome replicates without destroying the host.arrow_forward
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