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Viruses and Their Classification (GATE)

Proteins

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Questions

Question 1 Multiple Choice (Single Answer)

In viral replication cycle, phage can be recovered by disrupting the infected bacterium at which of the following periods?

  1. Rise period
  2. Latent period
  3. Eclipse period
  4. Fall period
Question 2 Multiple Choice (Single Answer)

Haloarcula hispanica pleomorphic virus 1 has which of the following properties?

A. ds DNA virus
B. Enveloped virus
C. Pleomorphic virus
D. Lytic virus

  1. A, B, C and D
  2. A, B and C
  3. B, C and D
  4. B and C
Question 3 Multiple Choice (Single Answer)

Which among the following viruses have enzyme thymidine kinase present in them?

  1. Circoviridae
  2. Herpesviridae
  3. Poxviridae
  4. Reoviridae
Question 4 Multiple Choice (Single Answer)

Which bacteriophages bypass the sheath contraction step of viral penetration in the host?

  1. T5
  2. T2
  3. T6
  4. PhiX174
Question 5 Multiple Choice (Single Answer)

Which of the following is a specific innate defence mechanism found especially in plants against viruses?

  1. Coagulation system
  2. RNA interferance
  3. Complement activation
  4. Pattern recognition receptors
Question 6 Multiple Choice (Single Answer)

Which of the following sentences is true about nucleic acid of viruses?

  1. All non-enveloped viruses are dsDNA virus.
  2. All enveloped viruses are dsDNA virus.
  3. Only ssDNA viruses are non-enveloped
  4. All dsRNA viruses are enveloped.
Question 7 Multiple Choice (Single Answer)

Which of the following is an example of icosahedral phage of E.coli?

  1. fd phage
  2. PhiX174
  3. f1 phage
  4. MS2
Question 8 Multiple Choice (Single Answer)

Which unit modifies phage DNA so that it can resist bacterial restriction enzymes after absorption?

  1. 5-Hydroxymethyltyrosine
  2. 5-Hydroxymethyl guanine
  3. 5-Hydroxymethyladenosine
  4. 5-Hydroxymethylcytosine
Question 9 Multiple Choice (Single Answer)

Bacteriophages are host-specific. Which of the following is the host for SPO2 phage?

  1. E.coli
  2. Salmonella
  3. Pseudomonas
  4. Bacillus subtilis
Question 10 Multiple Choice (Single Answer)

For isolation of phage phi6, the host organism used is

  1. E.coli
  2. Pseudomonas phaseolicola
  3. Mycobacterium tuberculosis
  4. Salmonella typhi
Question 11 Multiple Choice (Single Answer)

In 1967, Bradley grouped bacteriophages into six morphological types. Which group contained phages like T-odd coliphages T1 and T5?

  1. Group A
  2. Group B
  3. Group C
  4. Group D
Question 12 Multiple Choice (Single Answer)

In which bacteriophage is the phenomenon of terminal redundancy observed?

  1. Bacteriophage phi X 174
  2. Bacteriophage lambda
  3. Bacteriophage T4
  4. Bacteriophage M13
Question 13 Multiple Choice (Single Answer)

Which kind of recombination takes place between bacteriophage lambda and E.coli DNA?

  1. Site-specific recombination
  2. General recombination
  3. Replicative recombination
  4. Illegitimate recombination
Question 14 Multiple Choice (Single Answer)

Which of the following organisms are infected by LPP phages?

  1. Fungi
  2. Algae
  3. Bacteria
  4. Insects
Question 15 Multiple Choice (Single Answer)

Which of the following sentences about mycophages is untrue?

  1. All mycophages of higher fungi possess dsRNA.
  2. Killer system in Saccharomyces cerevisae is induced by mycophages.
  3. Cytopathic effect is not produced by mycophages in Agaricus.
  4. Some viruses of lower fungi have dsDNA.
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