A VIRUS, often measuring one nanometre in size, is invisible under a common light microscope, to say nothing of the naked eye.
Each virus is unique but relies on living cells to host its reproduction. This is achieved using a lock-and-key mechanism, e.g. the virus functions as a “key” that unpicks the “lock” that is the surface of the host cell. Upon gaining entry, the virus either takes over and makes use of the host cell’s resources to replicate, or it injects its genetic materials (known as provirus) into the host genome and deceives the host cell into replicating the virus.
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