Viruses are __ organisms.
(a) non-cellular
(b) multi-cellular
(c) invisible
(d) none of these
A strain of virus is made with nucleic acid of TMV (Tobacco mosaic virus) and protein coat of HRV (Holmes rib-grass virus) and then the tobacco leaf is infected
(a) Symptoms of TMV will appear
(b) Symptoms of HRV will appear
(c) Symptoms of both TMV and HRV will appear
(d) Symptoms of none of these will appear
Which of the following diseases is caused by viruses and transmitted by mosquitoes?
(a) Typhus
(b) Plague
(c) Trypansomiasis
(d) Yellow fever
Virion means
(a) Capsid of virus
(b) Complete form of a virus
(c) Nucleic acid of virus
(d) Dead virus
Virus is not the causative agent for which one of the following diseases?
(a) Tuberculosis
(b) Polio
(c) Rabies
(d) Common cold
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Virus causes
(a) Malaria
(b) Common cold
(c) Tetanus
(d) None of these
Dengue is caused by
(a) Culex
(b) Aedes egypti
(c) Male anapheles
(d) Female anopheles
Which of the following disease is caused by viral infection?
(a) Cholera
(b) Typhoid
(c) Diphtheria
(d) Inuenza
The smallest known agents of infectious diseases are
(a) Viroids
(b) Bacteria
(c) Viruses
(d) Fungi
Who is credited with showing that “Viruses are the cause of cancer”?
(a) Mendel
(b) Khorana
(c) Swaminathan
(d) Dulbecco
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The group of viruses which cause plant diseases is called
(a) Moulds
(b) Rusts
(c) Mosaics
(d) Phages
The carriers of viruses causing human yellow fever is
(a) Mosquito
(b) Bug
(c) Louse
(d) Beetle
The oral vaccine for polio was discovered by
(a) Sinsheimer
(b) Salk and Sabin
(c) Temin
(d) Lwoff
Which of the following characters justifies the living nature of viruses?
(a) Multiplicity
(b) Mutability
(c) Capability of protein (capsid) synthesis
(d) All of these
Which of the following viruses causes the common cold?
(a) Adeno virus
(b) Simian virus-40
(c) T4virus
(d) MSZ virus
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Chicken pox is caused by
(a) Bacteria
(b) Bacteriophage
(c) Varicella virus
(d) Pox virus
What is produced by vaccination in man and animals?
(a) Interferons
(b) Antigens
(c) Antibodies
(d) Antibiotics
‘Viroids’ differ from ‘viruses’ in being
(a) ‘Naked RNA’ molecules only
(b) ‘Naked DNA’ molecules only
(c) ‘Naked DNA’ packaged with viral genome
(d) ‘Satellite RNA’ packaged with viral genome
First vaccine (the antirabeic vaccine) was prepared by
(a) Salk
(b) Pasteur
(c) Jenner
(d) Koch
‘Little leaf disease’ of brinjal is caused by
(a) Fungi
(b) Bacteria
(c) Viruses
(d) None of these
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Common cold is caused by
(a) Bacteria
(b) Virus
(c) Unicellular algae
(d) Protozoa
The best supporting fact that “Viruses are living” is that viruses
(a) Are made of chemicals
(b) Cause diseases
(c) Duplicate themselves
(d) Penetrate cell membrane
Viruses cannot multiply of their own because they
(a) Do not have sex organs
(b) Lack genetic material
(c) Lack cellular machinery to use its genetic material
(d) None of the above
VIRUS stands for
(a) Vital Information Recourse Under Siege
(b) Vital Information Reason Under Siege
(c) Vital Information Recourse Under System
(d) Virus Information Recourse Under Siege
The virus which was first isolated
(a) Polio virus
(b) Influenza virus
(c) Tobacco mosaic virus
(d) Cyanophage
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Which one of the following statements about viruses is not correct?
(a) Can multiply outside a living cell
(b) Can be cultured in a cell free medium
(c) Have an independent metabolism
(d) Viruses are facultative parasites
Viruses multiply in
(a) Bacteria only
(b) All living cells
(c) Specific living cells
(d) Rotten food
Which of the following is true for viruses?
(a) They invariably contain DNA
(b) They multiply only in the host cell
(c) They occur only inside bacteria
(d) Their genetic material is RNA
Which of the following statements is not true for retroviruses?
(a) The genetic material in mature retroviruses is RNA
(b) Retroviruses are causative agents of certain kinds of cancer in man.
(c) DNA is not present at any stage in the life cycle of retroviruses.
(d) Retroviruses carry genes for RNA-dependent DNA polymerase
Of the following which will not grow on enriched agar is
(a) Penicillium
(b) Viruses
(c) Yeast
(d) Bread mould
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Which of the following characters justifies the living nature of viruses?
(a) Multiplicity
(b) Mutability
(c) Capability of protein (Capsid)
(d) All of these
Viruses were called Contagium vivum fluidum by
(a) de Herelle
(b) Bawden and Pirie
(c) Twort
(d) Beijerinck
One important characteristic of viruses is that they
(a) Can multiply outside a living cell
(b) Can be cultured in a cell-free medium
(c) Have an independent metabolism
(d) Do not have an independent metabolism
The virus was discovered by
(a) D. Ivanowsky
(b) Beijerinck
(c) Stanley
(d) Herelle
The Tobacco mosaic virus was crystallized for first time by
(a) W.M. Stanley
(b) Louis Pasteur
(c) Edward Jenner
(d) Andre Lwoff
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Polio virus contains
(a) Single stranded RNA
(b) Double stranded RNA
(c) Single stranded DNA
(d) Double stranded DNA
Which one of the following statements about viruses is correct?
(a) Viruses possess their own metabolic system
(b) Viruses contain either DNA or RNA
(c) Viruses are facultative parasites
(d) Viruses are readily killed by antibiotics
Caulimo virus (Cauliflower mosaic virus) are a group of viruses which have
(a) Double stranded RNA
(b) Single stranded RNA
(c) Single stranded DNA
(d) Double stranded DNA
The virus responsible for AIDS is an example of a (an)
(a) Adeno virus
(b) Mosaic virus
(c) T-even virus
(d) Retrovirus
Viroids differ from ‘viruses’ in being
(a) Naked RNA molecules only
(b) Naked DNA molecules only
(c) Naked DNA packaged with viral genome
(d) Satellite RNA packaged with viral genome
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Genetic material in TMV is
(a) DNA
(b) RNA
(c) Capsid
(d) Both DNA and RNA
Which of the following is the largest virus.
(a) Penicillium virus
(b) Wound tumour virus
(c) Pox virus
(d) None of the above
Which type of protein is found in viruses?
(a) Lyco protein
(b) Secondary protein
(c) Primary protein
(d) None of these
Which of the following diseases is not virus infected ?
(a) Measles
(b) Small pox
(c) Influenza
(d) Malaria
The viruses contain
(a) Proteins only
(b) DNA only
(c) Nucleic acids only
(d) Proteins, DNA or RNA (nucleic acids)
