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Viruses are about a ________ times smaller than bacteria ? Select the correct answer.

100
1000
10000
100000


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Which is false for a virus ?

Viruses by themselves are not alive
Enveloped viruses are surrounded by host cell
Virus particles are known as virions
They can multiply on their own


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In which year, The first images of viruses were obtained ?

1931
1938
1943
1951


The first images of viruses were obtained upon the invention of electron microscopy in 1931 by the German engineers Ernst Ruska and Max Knoll

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When a virus enters a cell but does not replicate immediately, the situation is called

Fermentation
Synergism
Lysogeny
Silvanzation


The condition of a host bacterium that has incorporated a phage into its own genetic material; "when a phage infects a bacterium it can either destroy its host or be incorporated in the host genome in a state of lysogeny"

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The HIV (human immunodeficiency virus) that causes AIDS attacks which cell of immune system ?

Q
R
S
T


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Which of the following viruses has not been associated with human cancer ?

Hepatitis C virus
Herpes simplex virus type 2
Varicella-Zoster virus
Hepatitis B virus


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Viruses display a wide diversity of shapes and sizes, called

Apomorphy
Morphologies
Phenetics
Synapomorphy


Morphology is a branch of biology dealing with the study of the form and structure of organisms and their specific structural features

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Which type of viruses are composed of a single type of capsomer stacked around a central axis ?

Helical
Icosahedral
Prolate
Complex


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In which stage of life cycle of viruses, Replication of viruses involves ?

3
4
5
6


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In how many groups, RNA viruses can be placed into depending on their modes of replication ?

3
4
5
6


All RNA viruses use their own RNA replicase enzymes to create copies of their genomes

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