Mer Scott
Quiz von , erstellt am more than 1 year ago

Objectives: describe the basic structural characteristics of viruses, compare the lytic and lysogenic replication cycles of bacteriophages, outline the replication cycles of mammalian cell viruses(naked and enveloped), describe the term viral latency in relation to the replication of bacterial and mammalian viruses.

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Mer Scott
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L5 Structure and Function of viruses

L5 Structure and Function of viruses

Frage 1 von 13

1

Which statement about viruses is NOT correct?

Wähle eine der folgenden:

  • Viruses can multiply only by using a dividing host cell's machinery.

  • Viruses are ubiquitous.

  • Virus particles are called virions.

  • There is estimated to be around 2000 viruses which affect humans.

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Frage 2 von 13

1

Which statements BEST describes viruses?

Wähle eine oder mehr der folgenden:

  • Viruses are a diverse group of acellular or 'sub-cellular' particles with no metabolic activity of their own, which rely on the biomachinery of their hosts to reproduce.

  • Viruses are very small non-living cells which hijack living cells in order to reproduce copies of themselves.

  • Viruses are ubiquitous 'sub-cellular' particles which rely on their hosts to reproduce.

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Frage 3 von 13

1

The independent particles of viruses are called , whose genetic material can be or double stranded DNA or . This is protected by a protein coat known as a .
Viruses with only a capsid are 'naked'. Viruses with an around this protein coat are 'enveloped'. This envelope of lipids can sometimes have .

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    virions
    single
    RNA
    capsid
    envelope of lipids
    glycoprotein spikes

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Frage 4 von 13

1

Select the statements about viral capsids which are CORRECT.

Wähle eine oder mehr der folgenden:

  • Viral capsids are always symmetrical and made of repetitive structures.

  • Capsomers and protomers are the sub-units of capsids.

  • Protomers are made up of capsomers.

  • Capsids can be helical, icosahedral, or complex in shape.

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Frage 5 von 13

1

Which order of the steps of the viral life cycle is CORRECT?

Wähle eine der folgenden:

  • entry, attachment, synthesis, assembly, release

  • attachment, entry, assembly, synthesis, release

  • attachment, entry, synthesis, assembly, release

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Frage 6 von 13

1

Lytic=virulent and lysogenic=latent.

Wähle eins der folgenden:

  • WAHR
  • FALSCH

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Frage 7 von 13

1

Bacteriophages are the virions which have a capsid specialised to infect bacterial cells.

Wähle eins der folgenden:

  • WAHR
  • FALSCH

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Frage 8 von 13

1

Which statement about bacteriophage replication types is INCORRECT?

Wähle eine der folgenden:

  • Lysogenic cycles are temperate e.g. can kill the cell or live within it.

  • The lytic cycle ends in cell lysing.

  • The lytic cycle releases 10-20 virions.

  • Lytic and lysogenic cells both inject their DNA into the host cell in order to reproduce.

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Frage 9 von 13

1

Which statement BEST describes a prophage?

Wähle eine oder mehr der folgenden:

  • A prophage is the phage genome of the bacteriophage, either integrated with the DNA of the Lysogen (bacterium) or floating free in its cytoplasm, able to produce a lytic phage.

  • A prophage is the inserted DNA from the bacteriophage which lives inside the host cell, known as the Lysogen.

  • The prophage lives in the Lysogen and can become a lytic phage.

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Frage 10 von 13

1

Which statement is true?

Wähle eine der folgenden:

  • Lytic insertion is followed by immediate degradation of host DNA while the lysogenic genome only becomes virulent when induction (environmental stress, UV irradiation) occurs.

  • Lytic insertion does not harm the host DNA until the final stage of the lytic cycle.

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Frage 11 von 13

1

Retroviruses must use the host cell's machinery, and their own enzyme Reverse Transcriptase, to make DNA from their RNA. An example is HIV.

Wähle eins der folgenden:

  • WAHR
  • FALSCH

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Frage 12 von 13

1

Naked viruses enter the cell via receptors (endocytosis). Enveloped viruses fuse their viral envelope with the host's membrane.

Wähle eins der folgenden:

  • WAHR
  • FALSCH

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Frage 13 von 13

1

The provirus (DNA of enveloped virus in host genome) is virulent.

Wähle eins der folgenden:

  • WAHR
  • FALSCH

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