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An antiviral substance produced by many vertebrates in response to viral In. fection for resisting the multiplication of viruses is known as

A. antivirin

B. antigen

C. virion

D. interferon

Correct Answer :

D. interferon


Related Questions

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Viruses are believed to be

A. living organisms

B. non-living organisms

C. a transitional group between living and non-living world

D. living organisms which have lost the power of multiplication

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Viruses differ from living organisms in that, they

A. can grow inside a living host

B. can multiply inside a living host

C. can undergo mutation inside a living host

D. are non-cellular

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A virus contains

A. an outer protein coat and a central core of DNA or RNA

B. outer RNA or DNA and a central core of proteins

C. only nucleic acids

D. only protein coats

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RNA particles causing symptoms like those of viral diseases is known as

A. virion

B. vira

C. viroid

D. none of these

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The exception to the cell theory of Schleiden and Schwann are

A. viruses

B. bacteria

C. algae

D. fungi

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A stage in the replication of virus, when the cell wall of host is ruptured is known as

A. lesion

B. lysis

C. autolysis

D. haemolysis

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Genetic modification brought about by a virus in a bmleria is known as

A. transformation

B. transduction

C. conjugation

D. candidiasis

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Where is the protein for protein coat of virus synthesized ?

A. RNA of the virus

B. DNA of the virus

C. RNA of the host

D. Ribosome of the host

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Which of the following is devoid of protein coat, with a constitution of RNA only ?

A. Tobacco mosaic virus

B. Poxvirus

C. Potato spindle tuber virus

D. None of these

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4

An antiviral substance produced by many vertebrates in response to viral In. fection for resisting the multiplication of viruses is known as

A. antivirin

B. antigen

C. virion

D. interferon

What is the correct answer?

4

Which of the following is a Capsid ?

A. Protein part of virus

B. Nucleic part of virus

C. Both (a) and (b)

D. None of these

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Most of the antibiotics have no effect on viruses as

A. they kill all bacteria which form host of viruses

B. viruses have no metabolism of their own

C. viruses form endospores

D. viruses are too small in size

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A bacteriophage and a yeast cell are similar in that, both

A. are colourless

B. have enzymes

C. have nucleic acids

D. none of these

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Viruses were discovered by

A. Stanley

B. Iwanowiski

C. Twort

D. Herelle

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The term 'Virus' has been derived from a Latin word meaning

A. poison

B. secretion

C. cell

D. venom

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Which of the following is a viral disease of potato ?

A. Early blight of potato

B. Late blight of potato

C. Leaf roll of potato

D. None of these

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Viruses with two types of symmetry, U. icosahedral head and helical tail are called

A. picornaviruses

B. binal viruses

C. riboviruses

D. none of these

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An extreme example of latency in which the DNA of the phage is integrated with the DNA of host cell chromosome is

A. lysis

B. lysogeny

C. prophage

D. attenuated virus

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The virus DNA which is incorporated into bacterial DNA is termed as

A. episome

B. mesosome

C. free DNA

D. T-phage

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Little leaf disease of brinjal is caused by

A. viruses

B. bacteria

C. fungi

D. none of these

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The disease in man caused by viruses is

A. mumps

B. cholera

C. typhoid

D. plague

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Virus was crystallized and isolated first by

A. D. Iwanowski

B. F.C. Bawden

C. W.M. Stanley

D. K.M.Smith

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Rabies is caused by

A. viruses

B. slimemoulds

C. fungi

D. bacterium

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Transduction was discovered by

A. Safferman and Morris

B. Lederberg and Zinder

C. Smithv and Knight

D. None of these

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A clear /.one lot uwhI in bacterial < olon due to viral action is railed

A. plaque

B. phnge

C. streak

D. krnn/

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Virus which attacks E.coli is called

A. bacteriophage

B. coliphage

C. phytophage

D. zoophage

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Edward Jenner discovered

A. vaccination against small pox

B. vaccination against chicken pox

C. immunization against small pox

D. immunization against chickcn pox

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Which of the following phenomenon is absent in virus ?

A. Replication

B. Mutation

C. Production of energy

D. Growth

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Influenza virus contains

A. DNA

B. RNA

C. both DNA and RNA

D. none of these

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Which of the following is an example of DNA containing plant virus ?

A. Tobacco mosaic virus

B. Potato mosaic virus

C. Cauliflower mosaic virus

D. Tomato mosaic virus