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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

Correct Answer :

A. Protein part of virus


Related Questions

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4

Virus which attacks E.coli is called

A. bacteriophage

B. coliphage

C. phytophage

D. zoophage

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4

The disease in man caused by viruses is

A. mumps

B. cholera

C. typhoid

D. plague

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4

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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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

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4

Roux Sarcoma virus contains

A. RNA

B. DNA

C. DNA and RNA

D. none of these

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4

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

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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4

Dahlia mosaic virus contains

A. DNA

B. RNA

C. DNA and RNA

D. None of these

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4

Little leaf disease of brinjal is caused by

A. viruses

B. bacteria

C. fungi

D. none of these

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4

Viruses are defined as

A. a buch of genomes which are looking for a suitable host for replication

B. micro-organisms which contains DNA only

C. smallest micro-organisms causing disease

D. micro-organisms which contains RNA only

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4

Transduction was discovered by

A. Safferman and Morris

B. Lederberg and Zinder

C. Smithv and Knight

D. None of these

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4

The exception to the cell theory of Schleiden and Schwann are

A. viruses

B. bacteria

C. algae

D. fungi

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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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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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4

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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4

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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Which of the following phenomenon is absent in virus ?

A. Replication

B. Mutation

C. Production of energy

D. Growth

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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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4

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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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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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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4

One of the interesting features of viruses is that they

A. multiply only in the host cytoplasm

B. are made up of proteins only

C. behave as if they were plants

D. occur only inside bacteria

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Virus is a.............................. stage between living and non-living.

A. balanced

B. threshold

C. transitional

D. none of these

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4

Influenza virus contains

A. DNA

B. RNA

C. both DNA and RNA

D. none of these

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4

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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4

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

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4

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

A. poison

B. secretion

C. cell

D. venom

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The smallest virus has a size of

A. 1 nm

B. 3 nm

C. 6 nm

D. 2 nm

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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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Virus was crystallized and isolated first by

A. D. Iwanowski

B. F.C. Bawden

C. W.M. Stanley

D. K.M.Smith