Name the disease-causing biological agent that is alive only inside the host cell.

Virus

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Fungi

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Bacteria

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Protozoan

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Solution

The correct option is A
Virus

A virus is a biological agent that reproduces inside the cells of living hosts. When infected by a virus, a host cell is forced to produce identical copies of the original virus, at an extraordinary rate in some cases. Outside the host cell, viruses are non-living as they lack a cellular machinery.

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Viruses are dead when it is outside a host cell. They are alive only inside a host cell.

Disease-causing biological agents are called __.

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