Question
Sun February 24, 2013 By: Anchita Thiagarajan

Viruses

Expert Reply
Mon February 25, 2013
Viruses are not classified in any kingdom yet because they are not really alive. They only show signs of life after they infect a host cell. Virus is a lifeless particle that does not carry out any metabolic functions on its own and cannot reproduce on its own until it invades a living host cell.
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