- They are non-cellular organisms, which is enclosed in a protective envelope.
- The presence of spikes helps in attaching the viruses to the host cell.
- These viruses do not grow, neither respire nor metabolize, but they reproduce.
- They are surrounded by a protein coat – capsid and have a nucleic acid core comprising DNA or RNA.
- They are considered both as living and non-living things. These viruses are inactive when they are present outside of host cells, but become active within host cells. These viruses cause several infections and reproduce within the host cell by using the enzymes and raw materials.

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