virus can't live outside host cell
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A virus outside a host cell is generally referred to as a virion. This is the inactive form of the virus that is unable to replicate until it enters a suitable host cell.
The host cell does not benefit from having a virus. The virus usually kills it.
The process in which a virus multiplies itself within a host cell is called replication. During replication, the virus uses the host cell's machinery to create copies of its own genetic material and proteins, eventually leading to the production of new virus particles that can infect other cells.
A virus needs a host cell to survive and replicate. Once inside a host cell, the virus can hijack the cell's machinery to make copies of itself. Without a host cell, viruses cannot survive for long periods outside of a living organism.
A host cell for a virus is a cell that the virus can infect and hijack to replicate itself. The virus enters the host cell, takes over its machinery to produce more virus particles, and then spreads to infect other cells.
A virus hijacks the host cell's machinery to replicate itself, causing the cell to produce more viruses. This can eventually lead to cell death and the spread of the virus to other cells.