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Virus
A simple, noncellular parasite that can reproduce only inside living cells. The simple structure of viruses is their most important characteristic. Most of them consist only of a genetic material - either DNA or RNA - and a protein coating. Some also have membranous envelopes. Viruses are "alive" in that they can reproduce themselves - although only by taking over a cell's synthetic machinery - but they have none of the other characteristics of living organisms. Viruses cause a large variety of significant diseases in plants and animals, including humans.