What is a Virus

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What is Life? Biologically, we can call any being as living when it grows, reproduces, excretes, respond to change in the environment. Considering the said definition of life, viruses are living organisms only when they are inside a living host, as when outside the body, they are in the form of crystals. So, they depend on host metabolic machinery to reproduce or replication. They are infectious and can be spread from one organism to another through different routes of transmission, including air, aerosol droplets, sexual contact, fecal matter, etc. Viruses are of different types, some have DNA, some lack DNA and use RNA to replicate by the process of reverse transcription. One of the most popular examples of RNA viruses is AIDS (Acquired Immunodeficiency Syndrome)Viruses have proteins covering their genome termed as capsids. 




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