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

Q
R
S
T


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In which step of Virus spread cycle, the viruses kills the host cell and search for a new host cell ?

Step 3
Step 4
Step 5
Step 6


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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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What is the shape of enveloped viruses ?

Pentagonal
Spherical
Helical
Complex


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Which virus was the first to be crystallised ?

Tobacco mosaic
Abaca mosiac
Bwamba
Canid herpesvirus


It is a positive-sense single stranded RNA virus that infects plants, especially tobacco and other members of the family Solanaceae.

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What is the oldest fossil age found for Virus ?

1 million years
10 million years
1.5 billion years
They do not form fossils


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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 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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