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Orthopoxvirus particles. A DNA virus is a virus that has a genome made of deoxyribonucleic acid (DNA) that is replicated by a DNA polymerase.They can be divided between those that have two strands of DNA in their genome, called double-stranded DNA (dsDNA) viruses, and those that have one strand of DNA in their genome, called single-stranded DNA (ssDNA) viruses. dsDNA viruses primarily belong ...
Examples of DNA viruses Virus family Examples (common names) Virion naked/enveloped Capsid symmetry Nucleic acid type Group 1. Adenoviridae: Canine hepatitis virus, Some types of the common cold: Naked Icosahedral ds I 2. Papovaviridae: JC virus, HPV: Naked Icosahedral ds circular I 3. Parvoviridae: Human parvovirus B19, canine parvovirus ...
The genetic material within virus particles, and the method by which the material is replicated, varies considerably between different types of viruses. DNA viruses The genome replication of most DNA viruses takes place in the cell's nucleus. If the cell has the appropriate receptor on its surface, these viruses enter the cell either by direct ...
Most organisms use DNA, but many viruses have RNA as their genetic material. The DNA or RNA of viruses consists of either a single strand or a double helix. [28] Viruses can reproduce rapidly because they have relatively few genes. For example, influenza virus has only eight genes and rotavirus has eleven. In comparison, humans have 20,000 ...
The replication of poxvirus is unusual for a virus with double-stranded DNA genome because it occurs in the cytoplasm, [15] although this is typical of other large DNA viruses. [16] Poxvirus encodes its own machinery for genome transcription, a DNA dependent RNA polymerase, [17] which makes replication in the cytoplasm possible. Most double ...
DNA replication separates the early and late phases. Once the early genes have liberated adequate virus proteins, replication machinery, and replication substrates, replication of the adenovirus genome can occur. A terminal protein that is covalently bound to the 5' end of the adenovirus genome acts as a primer for replication.
A viral disease (or viral infection) occurs when an organism's body is invaded by pathogenic viruses, and infectious virus particles (virions) attach to and enter susceptible cells. [ 1 ] Examples include the common cold , gastroenteritis , COVID-19 , the flu , and rabies .
Virus classification showing major ranks This is a list of biological virus families and subfamilies. See also Comparison of computer viruses. This is an alphabetical list of biological virus families and subfamilies; it includes those families and subfamilies listed by the ICTV 2023 report. [1] For a list of individual species, see List of ...