A virus is a contagious particle that multiplies by "commandeering" a host cell and exploiting that cell's resources to create further viruses.
- A virus is composed of a DNA or RNA genome enclosed in a capsid, a protein shell. Some viruses have a membrane envelope on the outside.
- Viruses come in a wide variety. They have various genome types, distinct forms and architectures, and they infect various hosts.
- By infecting their host cells and reprogramming them to become virus-producing "factories," viruses spread throughout the body.
Points of similarities between viruses and eukaryotic cells are as follows:
- Both viruses and eukaryotes have genetic material in the form of DNA.
- They are covered by an external membrane called envelope. In case of eukaryotes, an external cell membrane and cell wall (in case of plants) is also present which envelops the cytoplasm.
- Both have a capacity to change or evolve over time.
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