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1. Lytic phages lyse their host cells, whereas temperate phages either lyse their host or integrate their DNA into the host cell’s genome. Prophage DNA often codes for gene products that confer new properties on the host. Filamentous single-stranded DNA phages are extruded from the host cells without killing the cell.
How can a productive phage infection not kill a host cell?
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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 DNADuring 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. 0000Most phages that use DNA to propagate work by hijacking host bacterial machinery including RNA Polymerase. Scientists found that treatment of jumbo bacteriophage PhiKZ with Rifampicin did not stop the phage from propagating. What is allowing for the survival of this phage?
- Which of the following is a possible result of viral infection in eukaryotic host cells? O 1) Syncytialization of host cells. O 2) Inclusion bodies within the cytoplasm. O 3) oncogenesis. O 4) Host cell death 5) All of the abovephage 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 trasnductionHow is a provirus related to disease symptoms? A-the provirus continually lyses cells, causing disease symptoms B-the provirus periodically shifts to a lytic cycle, causing disease symptoms C-the provirus can produce endospores during unfavorable times D-the provirus secretes powerful toxins that make the host ill
- Which 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 cycleYou 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 scenarioCompare and contrast the mechanism of replication of T4 vs. filamentous phages.
- Most 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?An 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.Which is the usual order of a viral replication cycle when it is making new virions? O Host recognition > replication > entry > uncoating > release O Uncoating > host recognition > replication > entry > release O Prophase > metaphase > anaphase > telophase > cytokinesis Host recognition > entry > uncoating > replication > release MacBook Air DII DD F11 888 F8 F9 F7 F6 F5 F3 F4 & %24 % 7 8 LO