Genetics of virus 1 (MJC)

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frozespot171
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143882
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Genetics of virus 1 (MJC)
Updated:
2012-03-26 04:06:10
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MJC Genetics bacteria
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Genetics of bacteria
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  1. Which of the following information correctly represents the biochemical reaction catalyzed by viral reverse transcriptase?

    1) DNA to DNA
    2) DNA to RNA
    3) RNA to DNA
    4) RNA to protein
    3) RNA to DNA
  2. The viral envelop of virus consist of a _________ with membrane-associated viral __________.

    1) phospholipid bilayer, cholesterol
    2) phospholipid layer, proteins
    3) phospholipid layer, glycoproteins
    4) phospholipid bilayer, proteins
    4) phospholipid bilayer, proteins
  3. Scientists have discovered how to put together a bacteriophage with the protein coat of phage T2 and the DNA of phage T4. If this composite phage were allowed to infect a bacterium, the phages produced in the host cell would have

    1) the protein of T4 and the DNA of T2
    2) the protein of T2 an DNA of T4
    3) both the protein and DNA of T2
    4) both the protein and DNA of T4
    4) both the protein and DNA of T4
  4. Lambda phages can undergo _________ cycle(s) while T4 phage undergoes ________ cycle(s).

    1) lytic, lysogenic
    2) lysogenic, lytic
    3) both lysogenic and lytic,both lysogenic and lytic
    4) both lysogenic and lytic, lytic
    4) both lysogenic and lytic, lytic
  5. Emerging viruses arise by

    1) mutation of existing viruses.
    2) the spread of existing viruses to a new host species.
    3) broader dissemination of an existing virus within the current host population.
    4) All of the above.
    4) All of the above.
  6. Which of the following characteristics or processes is common to both bacteria and viruses?

    1) Transformation
    2) Binary fission
    3) Ribosomes in the cytoplasm
    4) Nucleic acid as the genetic material
    4) Nucleic acid as the genetic material
  7. Which step in the lytic cycle follows the attachment of virus and release of DNA into the cell?

    1) Production of lysozyme
    2) Hydrolysis of host DNA
    3) Assembly
    4) DNA replication
    2) Hydrolysis of host DNA
  8. The hepatitis C virus is a single-stranded, enveloped RNA virus which infects the human liver cells. Which of the following mechanisms explain how the viruses enter the host cell?

    1) Receptor-mediated endocytosis of the whole virus into the host cell
    2) Facilitated diffusion into the host cell through carrier proteins
    3) Diffusion through the cell membrane into the host cell
    4) Through pores in the host cell membrane created bythe viruses
    1) Receptor-mediated endocytosis of the whole virus into the host cell
  9. Which of the following about HIV virus are false?

    1) The HIV virus recognise the host cell throug sialic-acid containing proteins or lipids on the membrane of the host cell.
    2) The viral genome is released into the host cell by injection.
    3) The viral RNA which enters the host cell's nucleus will be integrated into the genetic material of the host cell using the host cell's enzyme, integrase.
    4) All of the above
    4) All of the above
  10. Which of the following cannot be the genetic material of a virus?

    1) Single-stranded DNA
    2) Double-stranded RNA
    3) Single-stranded RNA
    4) A mixture of RNA and DNA
    4) A mixture of RNA and DNA
  11. What type of molecules is the capsid in viruses made up of?

    1) Cellulose
    2) Phopholipid bilayer
    3) Lipoprotein layer
    4) Protein
    4) Protein
  12. HIV is a retrovirus that conatins all of the following except

    1) a capsid
    2) 2 copies of reverse transcriptase
    3) an envelope containing the viral proteins gp120 and gp41
    4) 2 copies of linear single-stranded negative-sense RNA
    4) 2 copies of linear single-stranded negative-sense RNA
  13. Viruses have the ability to cause diseases which can be harmful to the body. One antiviral drug would be through vaccines. How do vaccines operate?

    1) They are harmless versions of the virus so as to initiate an immune response to the virus so that the body will synthesize antigens that recognises the virus .
    2) They inhibit viral DNA/RNA polymerases and reverse transcriptases which in turn, prevents replication of viral genome and synthesis of viral proteins.
    3) They are entry/fusion inhibitors which interfere with binding, fusion and entry of HIV-1into the host cell by blocking one of several targets.
    1) They are harmless versions of the virus so as to initiate an immune response to the virus so that the body will synthesize antigens that recognises the virus .
  14. Which feature of the virus accounts for the fact that it is non-living?

    1) Presence of genetic material
    2) Capable of reproducing itself
    3) Obligate characteristic
    4) All of the above
    3) Obligate characteristic
  15. Which of the following is NOT a feature of a T4 bacteriophage?

    1) Its viral genome consists of a linear double-stranded DNA.
    2) It is a complex virus with an icosahedral capsid.
    3)It has a capsid that is attached to a contractile tail.
    4)None of the above
    4)None of the above

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