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  2. Question
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  4. Viruses are non-cellular organisms but replicate themselves once they infect the host cell. Out of the following,to which kingdom do viruses belong?

Q. Viruses are non-cellular organisms but replicate themselves once they infect the host cell. Out of the following,to which kingdom do viruses belong?

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Solution:

Viruses are acellular, obligate intracellular, parasitic and infectious agents. They have a simple body organisation,
  1. There is a protein coat, called capsid. This is made up of several monomers or units, called capsomeres.
  2. The genetic material can be either DNA or RNA, and never both. There are viruses with ssDNA and dsDNA, or ssRNA or dsRNA. Generally, the presence of ssDNA and dsRNA are unique in the viruses.
  3. Some viruses may have an envelop, besides the capsid.
Being acellular, they cannot be classified into any group which is made up of cells, like Monera, Protista, etc.