- Virus - Wikipedia
Viruses are considered by some biologists to be a life form, because they carry genetic material, reproduce, and evolve through natural selection, although they lack some key characteristics, such as cell structure, that are generally considered necessary criteria for defining life
- Virus | Definition, Structure, Facts | Britannica
Virus, infectious agent of small size and simple composition that can multiply only in living cells of animals, plants, or bacteria Viruses possess unique infective properties and thus often cause disease in host organisms Learn about the history, types, and features of viruses
- Viruses: Definition, Types, Characteristics Facts
A virus is a small piece of genetic information in a “carrying case” — a protective coating called a capsid Viruses aren’t made up of cells, so they don’t have all the equipment that cells do to make more copies of themselves
- Virus - National Human Genome Research Institute
A virus is an infectious microbe consisting of a segment of nucleic acid (either DNA or RNA) surrounded by a protein coat A virus cannot replicate alone; instead, it must infect cells and use components of the host cell to make copies of itself
- What Is a Virus? Definition, Structure, and How Viruses Work
When a virus enters the body, the innate immune system reacts first This non-specific defense includes barriers like skin, as well as cells that engulf and destroy invaders If the virus gets past this line, the adaptive immune system takes over
- Viruses - National Geographic Society
Viruses are microscopic biological agents that invade living hosts and infect their bodies by reproducing within their cell tissue Viruses are tiny infectious agents that rely on living cells to multiply They may use an animal, plant, or bacteria host to survive and reproduce
- Virus Explorer - HHMI
A host is an organism that a virus infects and replicates in Viruses can replicate only inside a host’s cell Hosts of viruses include animals, plants, bacteria, fungi, and archaea Many viruses have evolved to infect multiple kinds of hosts, while some viruses have a more limited host range
- What is a Virus? - News-Medical. net
A virus is a small infectious agent that can only replicate inside the cells of another organism
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