simple definition of virus
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A virus is a non-cellular, infectious entity composed of genetic material and protein that can only invade and reproduce within the living cells of bacteria, plants, and animals. A virus, for example, cannot replicate outside of the host cell. This is due to viruses lacking the necessary cellular machinery.
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- A virus is an infectious agent that can only multiply inside the confines of its host.
- Viruses infect bacteria, plants, and animals, among other living things.
- Viruses are so little that they require the use of a microscope to see them, and their structure is quite basic.
- When a virus particle is self-contained from its host, it consists of a viral genome, or genetic material, enclosed in a capsid, a protein shell.
- A membrane termed an envelope surrounds the protein shell in certain viruses.
- Viral genomes vary greatly in length and quantity of DNA or RNA molecules, and they can be single-stranded or double-stranded, linear or circular.
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