Taxonomic status of viruses Objective Question

1.Viruses do not contain:

  • a) Nucleus
  • b) Envelope
  • c) Cytoplasm
  • d) Organelle

2.Viruses are:

  • a) Obligate intracellular parasite
  • b) Obliged intracellular parasite
  • c) Obligated intercellular parasite
  • d) All of the above

3.Viruses are obligate intracellular parasites and this feature they share with:

  • a) Chlamydias
  • b) Mycobacteria
  • c) Rickettsias
  • d) Both a and c

4.A complete viral particle is called:

  • a) Virion
  • b) Viroid
  • c) Virusoid
  • d) All of the above

5.What does a virion consist of?

  • a) One molecule of DNA or RNA
  • b) Many molecules of DNA and RNA
  • c) One or more molecules of DNA or RNA
  • d) One or many molecules of DNA and RNA

6.If nucleic acid is only surrounded by protein coat, it is called:

  • a) Enveloped virus
  • b) Naked virus
  • c) Assembled virus
  • d) All of the above

7.The additional layer above the protein coat in some viruses is known as:

  • a) Nucleocapsid
  • b) Capsid
  • c) Enveloped virus
  • d) Any of the above

8.Nucleic acid surrounded by protein coat is known as:

  • a) Nucleocapsid
  • b) Naked virus
  • c) Both of the above
  • d) Capsid

9.In intracellular phase viruses are mainly found in form of:

  • a) Virions
  • b) Replicating nucleic acids
  • c) Capsids
  • d) Naked viruses

10.How viruses differ from living cells?

  • a) They are unable to reproduce independent of cells
  • b) Possess either DNA or RNA, but not both
  • c) Simple acellular entities, cannot undergo division like prokaryotes and eukaryotes
  • d) All of the above

11.What is true about viral genome?

  • a) Animal viruses possess all 4 different types of genome
  • b) Most bacterial viruses contain double stranded DNA as a genome
  • c) Most plant viruses contain single stranded RNA as a genome
  • d) All of the above

12.Which of the following is not the correct property used to classify viruses by ICTV?

  • a) Nucleic acid type and strandedness
  • b) Positive or negative sense of ssRNA genomes
  • c) Presence or absence of capsid
  • d) Dimension of the virion and capsid symmetry

13.The suffixes for order, families, subfamilies and genus of viruses are respectively:

  • a) Virales, viridae, virinae, virus
  • b) Viridae, virales, virinae, virus
  • c) Virales, virinae, viridae, virus
  • d) Virales, virus, viridae, virinae

14.Who gave alternative classification scheme for viruses?

  • a) David Baltimore
  • b) Peyton Rous
  • c) Dmitri Ivanowski
  • d) Walter Reed

15.Viscerotropic viruses are viruses that infect organs of:

  • a) Respiratory tract
  • b) Digestive tract
  • c) Nervous system
  • d) All of the above

16.Animal viruses are grouped on the basis of tissue as:

  • a) Neurotropic
  • b) Dermotropic
  • c) Pneumotrpic
  • d) All of the above

17.The ICTV committee meets every _ years to the rules of classification:

  • a) 2
  • b) 3
  • c) 4
  • d) 5