VIRUSES FROM ANIMAL AND PLANTS QUIZ

Supercoiling refers to the extra turns in the structure of ds DNA due to the action of

RNA gyrase

DNA pyrase

DNA gyrase

RNA pyrase

TRUE ANSWER : ?
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West Nile virus can cause a disease in human beings that may be transmitted from an infected bird to a person by a mosquito. This is an example of

arthropod borne disease

nosocomial infection

fomite borne disease

endogenous infection

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What does the positive strand in double stranded RNA viruses stands for?

rRNA

mRNA

None of these

tRNA

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The transcription of the viral nucleic acid into mRNA is not necessary in case of

all of these

RNA viruses

ds DNA viruses

ss DNA viruses

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Icosahedral viruses are generally

polio viruses

adeno viruses

both (a) and (b)

none of these

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The two major components of viruses are

fat and protein

nucleic acid and protein

carbohydrate and nucleic acid

fat and carbohydrate

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The uncontrolled proliferation of cells is termed as

metastasis

all of these

anaplasia

hyperplasia

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Which of the following characteristics would not be used to classify viruses?

Type of cell wall structure

Symmetry

Presence of an envelope

Type of nucleic acid

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Negative strand ssRNA viruses need to have a preformed replicase when they invade a mammalian cell because they

have to make a positive strand copy that can be translated

None of these

use it to modify host enzymes that are recruited for viral replication

use it to terminate transcripts when they copy host cell mRNA

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The microbes which are most likely to be completely dependent on a plant or animal host are

viruses

fungi

algae

bacteria

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