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 disinfectant is effective against viruses?
A. Hydrogen peroxide
B. Hypochlorite
C. Formaldehyde
D. All of the above
Question 2
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
Question 3
Viruses require __________ for growth.
A. bacteria
B. plants
C. animals
D. living cells
Question 4
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
Question 5
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
Question 6
When a virus enters a cell but does not replicate immediately, the situation is called
A. lysogeny
B. fermentation
C. symbiosis
D. synergism
Question 7
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
Question 8
The first step in infection of a host bacterial cells by a phage is
A. adsorption
B. absorption
C. penetration
D. replication
Question 9
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
Question 10
The viral nucleocapsid is the combination of
A. genome and capsid
B. capsid and spikes
C. envelope and capsid
D. capsomere and genome
Question 11
Edward Jenner began inoculating humans with material from __________ lesions.
A. Smallpox
B. Avianpox
C. Cowpox
D. Chickenpox
Question 12
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
Question 13
Enveloped viruses have a __________ shape.
A. icosahedral
B. helical
C. roughly spherical
D. complex
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
Question 15
Which of the following is semi-continuous (diploid) cell line?
A. HeLa
B. HEp-2
C. WI-38
D. KB
Question 16
Plant viruses may be cultivated in
A. tissue culture
B. cultures of separated cells
C. whole plants
D. All of the above
Question 17
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
Question 18
In cell culture, measles virus may lead to
A. nuclear pyknosis
B. transformation of cells
C. syncytium formation
D. rounding and aggregation of cells
Question 19
A change from lysogeny to lysis is generally induced by
A. ultraviolet light
B. chemicals
C. irradiation
D. All of the above
Question 20
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
Question 21
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
Question 22
The capsomeres consist of a number of proteins subunits or molecules called
A. protomers
B. caproprotein
C. procapsid
D. None of these
Question 23
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
Question 24
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
Question 25
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
Question 26
A change from lysogeny to lysis is generally induced by
A. ultraviolet light
B. chemicals
C. irradiation
D. all of these
Question 27
Enzyme neuraminidase is carried by which of the following viruses?
A. Human immunodeficiency virus
B. Epstein-Barr virus
C. Influenza virus
D. Adenovirus
Question 28
Group E phages have
A. single stranded DNA
B. double stranded DNA
C. single stranded RNA
D. double stranded DNA
Question 29
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
Question 30
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
Question 31
Plant viruses may be cultivated in
A. tissue culture
B. cultures of separated cells
C. whole plants
D. all of these
Question 32
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
Question 33
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
Question 34
The size of viruses is usually measured in
A. centimeters
B. micrometers
C. nanometers
D. millimeters
Question 35
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
Question 36
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
Question 37
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
Question 38
Viruses largely lack metabolic machinery of their own to generate energy or to synthesize
A. protein
B. carbohydrate
C. alcohol
D. all of these
Question 39
Which of the following disinfectant is effective against viruses?
A. Hydrogen peroxide
B. Hypochlorite
C. Formaldehyde
D. All of these
Question 40
Which of the following is continuous cell line?
A. HeLa
B. HEp-2
C. KB
D. All of these
Question 41
Which of the following may affect proteins and nucleic acids, but not viruses?
A. Denaturation
B. Enzyme treatment
C. Pressure
D. All of these
Question 42
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
Question 43
Which of the following virus is susceptible to chloroform?
A. Herpes
B. Influenza
C. Measles
D. All of these
Question 44
Which of the following viruses belong to family Flaviviridae?
A. Rubella virus
B. Yellow fever virus
C. Hepatitis C virus
D. All of these
Question 45
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
Question 46
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