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The head of the bacteriophage has a protein coat called capsid which encloses a highly folded double-stranded DNA.

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Important Questions on Classification of Living Organisms

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Biology>Diversity of Living Organism>Classification of Living Organisms>Virus and Viroids
Creutzfeldt Jakob Disease CJD is a transmissible disease caused by a
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Biology>Diversity of Living Organism>Classification of Living Organisms>Virus and Viroids
Which of the following is correct about viroids?
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Biology>Diversity of Living Organism>Classification of Living Organisms>Virus and Viroids
The proteinaceous infectious particle which can cause some serious animal diseases are called:
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Biology>Diversity of Living Organism>Classification of Living Organisms>Virus and Viroids
The concept of "Contagium vivum fluidum" was given by
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Biology>Diversity of Living Organism>Classification of Living Organisms>Virus and Viroids
Which of the following statements is wrong for viroids?
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Biology>Diversity of Living Organism>Classification of Living Organisms>Virus and Viroids
Causal organism of the disease cucumber pale fruit is ______.
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Biology>Diversity of Living Organism>Classification of Living Organisms>Virus and Viroids

Identify the parts labelled 1,2,3,4 in the given figure

Question Image

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Biology>Diversity of Living Organism>Classification of Living Organisms>Virus and Viroids
Viroid's differ from viruses in ______
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Biology>Diversity of Living Organism>Classification of Living Organisms>Virus and Viroids
Which of the following statements is incorrect?
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Biology>Diversity of Living Organism>Classification of Living Organisms>Virus and Viroids
Viruses have
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Biology>Diversity of Living Organism>Classification of Living Organisms>Virus and Viroids
Identify the correct statements among the following.
(A) No virus contains both DNA and RNA.
(B) Viroids were named by Pasteur.
(C) Scrapie disease of sheep is caused by proteins.
(D) In the six kingdom classification three domains are present.
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Biology>Diversity of Living Organism>Classification of Living Organisms>Virus and Viroids
What is the genetic material of Ebola virus?
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Biology>Diversity of Living Organism>Classification of Living Organisms>Virus and Viroids
Select the incorrect statement with reference to structure of TMV ?
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Biology>Diversity of Living Organism>Classification of Living Organisms>Virus and Viroids

Match the following lists:

  List I   List II
A) No sex organs, dikaryotic exogenous spores I) Gonyaulax
B) Infectious agents without nucleic acids II)  Trichodesmium
C) Differentiated cytoplasm bloom in polluted water bodies III) Slime moulds
D) Fruiting bodies bearing spores survive many years IV) Basidiomycetes
    V) Prions

The correct match is

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Biology>Diversity of Living Organism>Classification of Living Organisms>Virus and Viroids
Assertion (A): Bacteriophages have the ability to replicate within bacterial cells.
Reason (R): Bacterial plasmids have very high copy numbers of their genome in the bacterial cells.
The correct option among the following is:
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Biology>Diversity of Living Organism>Classification of Living Organisms>Virus and Viroids
Prophage is viral genome _______
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Biology>Diversity of Living Organism>Classification of Living Organisms>Virus and Viroids
T. O. Diener 1971 discovered a new infectious agent that was smaller than vinses. Consider the following statements about this infectious agent.
(i) It causes potato spindle tuber disease
(ii) These are infections RNA particles
(iii) It lacks the protein coat
(iv) The molecular weight of its RNA is low
The above statements are assigned to
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Biology>Diversity of Living Organism>Classification of Living Organisms>Virus and Viroids
Which of the following shows coiled RNA strand and capsomeres?
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Biology>Diversity of Living Organism>Classification of Living Organisms>Virus and Viroids
Viroids differ from viruses in having:
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Biology>Diversity of Living Organism>Classification of Living Organisms>Virus and Viroids
Select the wrong statement.