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