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Which one of the following statements about viruses is correct?

Viruses are obligate parasites
All viruses contain both RNA and DNA
Viruses possess their own metabolic system
Nucleic acid of viruses is known as Capsid
Additional Questions

Viroids have

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Chromosomes in a bacterial cell can be 1 - 3 in number and

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How does enveloped virus enter into host cells?

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dsRNA is found in

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Tailed bacteriophages are

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Match the types of bacteria listed in column I with their activity given in column II. Choose the correct combination of alphabets of the two columns.

Column - I (Types of bacteria)Column - II (Activity)
A Streptomycesp Food poisoning
B Rhizobiumq Source of Antibiotics
C Nitrosomonasr Nitrogen fixation
D Acetobacters Nitrification
t Vinegar synthesis

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Due to discovery of which of the following in 1980, the evolution was termed as RNA world

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One important characteristic of viruses is that they

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Which type of DNA is found in bacteria?

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The non-living characteristic of viruses is

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