Virus is a small infectious agent that replicates only inside the living cells of an organism. Viruses can infect all types of life forms, from animals and plants to microorganisms, including bacteria and archaea.
Virus is a microscopic organism which cannot be seen by an ordinary Microsoft but with an electron Microsoft. Virus is seen as being on the borderline between living and non-living things.
CHARACTERISTIC OF VIRUS
1. Virus is Microscopic in nature
2. It possesses either RNA or DNA
3. It cannot reproduce by binary fission
4. It does not have structure used in the synthesis of protein
5. It does not Respire, Feed, Excrete e.t.c
6. It is responsible for the cause of many chronic diseases like Aids, Small pox, Influenza, Measles e.t.c.
VIRUS AS A LIVING THING
Virus is often regarded as a living or animated ting because of the following reasons:
1. Virus can reproduce when present in other living cell
2 . It possess characteristic which can be transmitted from one generation to the next
VIRUS AS A NON-LIVING THING
Virus is often regarded as a non-living thing because of the following reasons:
1. When a virus is extracted from a living cell and placed in anon-living medium, it assumes a Crustalline Form and becomes non-living.
2. Virus cannot respire, excrete or respond to stimuli.
The Scientific process of classifying or arranging living thing into group base on structural genetic or cellular organization is called “Classification or Taxonomy”.
The science of taxonomy has two branches, the naming of organism into group known as “Nomenclature” and placing of organism into group known as “Systematic.”
Scientifically every living organism has two names the first name is known as the “Genus” name which begin with capital letter, to which closely related species belongs. Different species belong to a genus just as the surname of our family.
The second name is the species name which begin with the small letter, to which the organism belong to one kind of organism only.
Example: The scientific name of man is “Homo sapiens” Housefly “Musca domestica” Potato “Ipomea botata”. Thus the science system of giving two name to an organism is known as “Botanical Nomenclature” it was developed by a Skledish naturalist and Botanist Carl Linnaeus in 18th century (1707 – 1778).
THE TAXONOMIC HIERACHY
Linnaeus eventually extended the binomial system to include more group than genius and species. Those he arranged in a hierarchy with the largest group Kingdom at the top, these are as follows:
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