Virusoids are essentially viroids that are circular single-stranded RNA. They consist of several hundreds of nucleotides and does not code for any proteins. They have been encapsulated by a helper virus coat protein. It is the main difference of virusoid and viroids. It was first discovered by J. W. Randles and coworkers in 1981. They are present in bacteria, plants, fungi, invertebrates and vertebrates. They are larger than viroids.

ssRNA not enclosed by protein coat

ssDNA not enclosed by protein coat

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What is virusoids?

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Biology>Diversity of Living World>Living World>Viruses and Bacteriophage

Viroid's differ from viruses in ______

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Biology>Diversity of Living World>Living World>Viruses and Bacteriophage

Select the wrong statement.

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Biology>Diversity of Living World>Living World>Viruses and Bacteriophage

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 World>Living World>Viruses and Bacteriophage

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 World>Living World>Viruses and Bacteriophage

Viroids differ from viruses in having:

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Biology>Diversity of Living World>Living World>Viruses and Bacteriophage

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 World>Living World>Viruses and Bacteriophage

Which of the following statements is wrong for viroids?

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Biology>Diversity of Living World>Living World>Viruses and Bacteriophage

Difference between virus and viroid is

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Biology>Diversity of Living World>Living World>Viruses and Bacteriophage

Viroids are small single-stranded circular 'naked DNA' molecules.

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Biology>Diversity of Living World>Living World>Viruses and Bacteriophage

Which of the following statements is wrong for viroids?

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Biology>Diversity of Living World>Living World>Viruses and Bacteriophage

Prions which have been reported to cause mad cow's disease, Alzheimer's disease etc. are

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Biology>Diversity of Living World>Living World>Viruses and Bacteriophage

Difference between virus and viroid is

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Biology>Diversity of Living World>Living World>Viruses and Bacteriophage

Bovine spongiform encephalopathy a bovine disease, is related to which human disease?

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Biology>Diversity of Living World>Living World>Viruses and Bacteriophage

Differentiate between viruses and viroids.

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Biology>Diversity of Living World>Living World>Viruses and Bacteriophage

Viroids have

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Biology>Diversity of Living World>Living World>Viruses and Bacteriophage

Represent the union of two sets by Venn diagram for each of the following.

$X = {x | x$ is a prime number between $80$ and $100}$

$Y = {y | y$ is an odd number between $90$ and $100}$

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Biology>Diversity of Living World>Living World>Viruses and Bacteriophage

Which of the following is wrongly matched?

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Biology>Diversity of Living World>Living World>Viruses and Bacteriophage

Viroids differ from viruses in having

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Biology>Diversity of Living World>Living World>Viruses and Bacteriophage

Read the given statements that describe certain infectious particles.
(i) It was discovered by T.O. Diener and was found to be smaller than viruses.
(ii) It causes potato spindle tuber disease.
(iii) It is a free RNA particle that lacks the protein coat.
(iv) It has low molecular weight RNA as genetic material.
Which of the following is referred to here?

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Biology>Diversity of Living World>Living World>Viruses and Bacteriophage

Difference between virus and viroid is

What is virusoids?

Important Questions on Living World

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