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Viruses are small obligate intracellular parasites, which by definition contain either a RNA or DNA genome surrounded by a protective, virus-coded protein coat. Viruses may be viewed as mobile genetic elements, most probably of cellular origin and characterized by a long co-evolution of virus and host.
6 gru 2017 · The main difference between DNA and RNA viruses is that DNA viruses contain large genomes due to the accurate replication whereas RNA viruses contain small genomes due to the error-prone replication.
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(a) Rabies virus has a single-stranded RNA (ssRNA) core and an enveloped helical capsid, whereas (b) variola virus, the causative agent of smallpox, has a double-stranded DNA (dsDNA) core and a complex capsid.
31 paź 2023 · Viruses are classified in several ways: by factors such as their core content, the structure of their capsids, and whether they have an outer envelope. Viruses may use either DNA or RNA as their genetic material. The virus core contains the genome or total genetic content of the virus.
4 lut 2018 · Introduction to Viruses. Viruses are obligate intracellular infectious agents with the following basic components. DNA or RNA. never both. capsid. a protein coat that surrounds the genetic material. icosahedral or helical symmetry. made of capsomers. polypeptide chains organized into a globular subunit.
