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Viruses MCQ Questions & Answers

Viruses MCQs : This section focuses on the "Viruses". These Multiple Choice Questions (MCQs) should be practiced to improve the Viruses skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.




Question 1

Which of the following may affect proteins and nucleic acids, but not viruses?

A. Denaturation
B. Enzyme treatment
C. Pressure
D. All of these

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Question 2

Plant viruses may be cultivated in

A. tissue culture
B. cultures of separated cells
C. whole plants
D. All of the above

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Question 3

Which of the following viruses belong/s to family caliciviridae?

A. Hepatitis B virus
B. Hepatitis D virus
C. Hepatitis E virus
D. All of these

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Question 4

Which of the following is continuous cell line?

A. HeLa
B. HEp-2
C. KB
D. All of these

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Question 5

When a virus enters a cell but does not replicate immediately, the situation is called

A. lysogeny
B. fermentation
C. symbiosis
D. synergism

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Question 6

The bacterial viruses having head made up of large capsomeres, but no tail is morphologically classified as

A. A
B. B
C. C
D. D

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Question 7

Viruses largely lack metabolic machinery of their own to generate energy or to synthesize

A. protein
B. carbohydrate
C. alcohol
D. All of the above

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Question 8

The viral DNA is removed from the host's chromosomes and the lytic cycle occurs. The process is called

A. spontaneous induction
B. inductive infection
C. resultant induction
D. spontaneous infection

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Question 9

Which of the following viruses belong to family Flaviviridae?

A. Rubella virus
B. Yellow fever virus
C. Hepatitis C virus
D. All of these

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Question 10

The oncogene theory refers to

A. how chemicals inactivate viruses when applied
B. how viruses replicate in host cells
C. how viruses transform normal cells into tumor cells
D. None of these

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Question 11

Usually viruses are separated into several large groups based primarily on

A. nature of the host
B. nucleic acid characteristics
C. capsid symmetry
D. diameter of the viroin or nucleocapsid

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Question 12

In order for a virus to replicate

A. the capsid must enter the host cell cytoplasm
B. the host cell must be undergoing mitosis
C. the genome must be released in the cytoplasm
D. the host cell must lack a cell membrane

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Question 13

A change from lysogeny to lysis is generally induced by

A. ultraviolet light
B. chemicals
C. irradiation
D. All of the above

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Question 14

The envelope of which of the following viruses is derived from the host cell nucleus?

A. Paramyxoviruses
B. Retroviruses
C. Orthomyxoviruses
D. Herpesviruses

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Question 15

Which of the following viruses show/s transformation of infected cells?

A. Hepatitis B virus
B. Human T cell lymphotronic virus type I
C. Epstein-Barr virus
D. All of the above

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Question 16

The temperate phage possesses a gene that codes for a repressor protein which makes the cell resistant to lysis initiated by

A. the prophage
B. lytic infection by other viruses
C. Both (a) and (b)
D. none of these

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Question 17

The viral nucleocapsid is the combination of

A. genome and capsid
B. capsid and spikes
C. envelope and capsid
D. capsomere and genome

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Question 18

Which of the following viruses has not been associated with human cancer?

A. Hepatitis C virus
B. Hepatitis B virus
C. Varicella-Zoster virus
D. Herpes simplex virus type 2

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Question 19

Lysozyme (an endolysin) which will lyse the bacterial cell, releasing the mature virions is present in

A. immediate early phage genes
B. late genes
C. delayed early genes
D. all of these

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Question 20

Plant viruses may be cultivated in

A. tissue culture
B. cultures of separated cells
C. whole plants
D. all of these

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Question 21

Reverse transcriptase is a useful enzyme to have when

A. an RNA virus converts its RNA to DNA
B. there are no host cells present
C. nutrients are scarce
D. spikes are forming in the new virus

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Question 22

Viruses largely lack metabolic machinery of their own to generate energy or to synthesize

A. protein
B. carbohydrate
C. alcohol
D. all of these

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Question 23

In the simplest capsid, there is a capsomere at each of the 12 vertices; this capsomere, which is surrounded by five other capsomeres, is termed a

A. penton
B. polyhedra
C. icosahedral
D. helical

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Question 24

The first step in infection of a host bacterial cells by a phage is

A. adsorption
B. absorption
C. penetration
D. replication

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Question 25

Which of the following virus is susceptible to chloroform?

A. Herpes
B. Influenza
C. Measles
D. All of these

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Question 26

Edward Jenner began inoculating humans with material from __________ lesions.

A. Smallpox
B. Avianpox
C. Cowpox
D. Chickenpox

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Question 27

The size of viruses is usually measured in

A. centimeters
B. micrometers
C. nanometers
D. millimeters

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Question 28

Which of the following viruses show/s transformation of infected cells?

A. Hepatitis B virus
B. Human T cell lymphotronic virus type I
C. Epstein-Barr virus
D. All of these

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Question 29

Which of the following disinfectant is effective against viruses?

A. Hydrogen peroxide
B. Hypochlorite
C. Formaldehyde
D. All of these

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Question 30

The sequence of nucleic acid in a variety of viruses and viral host, will find more similarities

A. among different viruses than between viruses and their hosts
B. among different viral hosts than among different viruses
C. among different viral hosts than between viruses and their hosts
D. between viruses and their hosts than among different viruses

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Question 31

In cell culture, measles virus may lead to

A. nuclear pyknosis
B. transformation of cells
C. syncytium formation
D. rounding and aggregation of cells

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Question 32

A change from lysogeny to lysis is generally induced by

A. ultraviolet light
B. chemicals
C. irradiation
D. all of these

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Question 33

Group E phages have

A. single stranded DNA
B. double stranded DNA
C. single stranded RNA
D. double stranded DNA

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Question 34

Enveloped viruses have a __________ shape.

A. icosahedral
B. helical
C. roughly spherical
D. complex

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Question 35

The temperate phage that have no site specificity for insertion and may even be able to insert multiple copies of their DNA into a single bacterial chromosome is

A. λ phage enzyme
B. λ DNA
C. Phage Mu
D. Phage Mn

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Question 36

Enzyme neuraminidase is carried by which of the following viruses?

A. Human immunodeficiency virus
B. Epstein-Barr virus
C. Influenza virus
D. Adenovirus

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Question 37

The lysogenic state is governed by the activity of the regulatory region of the lambda phage genomes; this region is termed as

A. immunity repressor
B. immunity operon
C. operon repressor
D. None of these

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Question 38

Which of the following disinfectant is effective against viruses?

A. Hydrogen peroxide
B. Hypochlorite
C. Formaldehyde
D. All of the above

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Question 39

Which of the following statements is not true of viruses?

A. Viruses have been successfully grown in pure cultures in test tubes
B. All viruses are obligatory intracellular parasites
C. All viruses have either DNA or RNA as their genetic material
D. Viruses probably arose from small fragments of cellular chromosomes

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Question 40

The viruses in an attenuated vaccine

A. have no genome
B. continue to replicate
C. are usually larger than bacteria
D. is altered with chemicals

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Question 41

The capsomeres consist of a number of proteins subunits or molecules called

A. protomers
B. caproprotein
C. procapsid
D. None of these

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Question 42

Which of the following viruses belong to family Flaviviridae?

A. Rubella virus
B. Yellow fever virus
C. Hepatitis C virus
D. All of the above

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Question 43

Which of the following is semi-continuous (diploid) cell line?

A. HeLa
B. HEp-2
C. WI-38
D. KB

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Question 44

The repressor protein, since the cell is resistant to lysis from externally infecting phage, is also called

A. immunity repressor
B. immunity operon
C. operon repressor
D. none of these

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Question 45

Viruses require __________ for growth.

A. bacteria
B. plants
C. animals
D. living cells

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Question 46

The viral DNA of the temperate phage, instead of taking over the functions of the cell's genes, is incorporated into the host DNA and becomes a prophage in the bacterial chromosome, acting as a gene. This happens in

A. lysogeny
B. spontaneous induction
C. lytic phase
D. none of these

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