Viruses are not alive. This is because even though viruses are made up of molecules (proteins, nucleic acids, carbohydrates and lipids), they cannot do anything on their own, until they enter or come into contact with a living cell. Viruses cannot multiply without having a host cell to initiate the process. Another reason would be that viruses don’t actually do anything on their own. Whenever a virus comes into contact with a cell, a series of chemical reaction occur that lead to the production of new virus. This is a completely passive thing, more of a side effect of virus’ predetermined nature of its molecules. These molecules are either DNA or RNA.
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