A virus is a minute infectious agent that, in general, cannot be seen with a light microscope. It lacks an independent metabolism and is able to replicate only within a living host cell. A free virus particle does not carry out the functions of a living cell, such as respiration and growth, and may be thought of as a packaging device by which viral genetic material can be introduced into appropriate host cells. What are the arguments for and against classifying viruses as living organisms? Discussfrom Article of the Day http://ift.tt/1pT1bST
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