Diseases caused by adenoviruses are : 1. Grpoup 2.
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Picorna virus Virions naked ,icosahedral. Capsid is composed of 60 copies of 4 structiural protein. Viral genome are linear 7. The spikes consists of glycoprotein that help in attachment protein to receptor of host cell membrane.
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Group 4. Rhabdovirus Envelop with spikes made up of gly coprotein linked matrix protein contain nucleocapsid Eg.
Mumps virus , rabies virus Orthomyxo virus Group 5. You just clipped your first slide! Clipping is a handy way to collect important slides you want to go back to later.
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Viral Replication | Boundless Microbiology
Cancel Save. An example of a family within this classification is the Adenoviridae. There is only one well-studied example in which a class 1 family of viruses does not replicate within the nucleus. This is the Poxvirus family, which comprises highly pathogenic viruses that infect vertebrates. Viruses that fall under this category include ones that are not as well-studied, but still do pertain highly to vertebrates. Two examples include the Circoviridae and Parvoviridae.
The Life Cycle of Viruses with Prokaryote Hosts
They replicate within the nucleus, and form a double-stranded DNA intermediate during replication. A human Anellovirus called TTV is included within this classification and is found in almost all humans, infecting them asymptomatically in nearly every major organ. Double-stranded RNA viruses are not as well-studied as other classes. This class includes two major families, the Reoviridae and Birnaviridae. Replication is monocistronic and includes individual, segmented genomes, meaning that each of the genes codes for only one protein, unlike other viruses, which exhibit more complex translation.
These viruses consist of two types, however both share the fact that replication is primarily in the cytoplasm, and that replication is not as dependent on the cell cycle as that of DNA viruses.
Reproduction: DNA Animal Viruses
This class of viruses is also one of the most-studied types of viruses, alongside the double-stranded DNA viruses. The positive-sense RNA viruses and indeed all genes defined as positive-sense can be directly accessed by host ribosomes to immediately form proteins. These can be divided into two groups, both of which replicate in the cytoplasm:. Examples of this class include the families Coronaviridae , Flaviviridae , and Picornaviridae.
Animal & human viruses
The negative-sense RNA viruses and indeed all genes defined as negative-sense cannot be directly accessed by host ribosomes to immediately form proteins. Instead, they must be transcribed by viral polymerases into the "readable" complementary positive-sense. These can also be divided into two groups:.
Examples in this class include the families Orthomyxoviridae , Paramyxoviridae , Bunyaviridae , Filoviridae , and Rhabdoviridae which includes rabies. A well-studied family of this class of viruses include the retroviruses. Instead of using the RNA for templates of proteins, they use DNA to create the templates, which is spliced into the host genome using integrase.
Replication can then commence with the help of the host cell's polymerases. This small group of viruses, exemplified by the Hepatitis B virus, have a double-stranded, gapped genome that is subsequently filled in to form a covalently closed circle cccDNA that serves as a template for production of viral mRNAs and a subgenomic RNA. Replication of DNA of viruses usually takes place in the nucleus of the host cell; poxviruses are the exceptions because their genome replicates in the cytoplasm of the host cell.
For convenience, two examples herpes-viruses and hepadnaviruses of DNA replication are as follows:. Herpesviruses e. Its genome is a linear piece of DNA about 1,60, base pairs in size and contains at least genes. Immediately upon un-coating, a portion of viral DNA i. The DNA circularizes and its replication begins with the help of virus-specific DNA polymerase in the nucleus of the cell within 4 hours after infection.
This results in the synthesis of new viral DNA molecules. Consequently, the other portion of the viral DNA i.
Related Reproduction: DNA Animal Viruses
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