Viruses possess unique infective properties and thus often cause disease in host organisms. It surrounds the capsid and helps protect the virus from the hosts immune system.



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The outer protein shell of a virus.

Basic virus cell diagram. Virus structure and classification. Learn about the history types and features of viruses. Central core of nucleic acid of a virus is called genome and the protein coat surrounding is called as capsid.

The virus core contains the small single or double stranded genome that encodes the proteins that the virus cannot get from the host cell. A major branch of virology is virus classificationviruses can be classified according to the host cell they infect. Virally coded proteins will self assemble to form a capsid.

It requires a host cell to replicate itself and uses the host cell replication and protein synthesis machinery to create progeny of its own. Of or being a. The capsid of the virus shown in figure below is icosahedral.

However the virus replaces the proteins in the cell membrane with its own proteins creating a hybrid structure of cell derived lipids and virus derived proteins. A virus is a chain of nucleic acids dna or rna which lives in a host cell uses parts of the cellular machinery to reproduce and releases the replicated nucleic acid chains to infect more cells. Virus infectious agent of small size and simple composition that can multiply only in living cells of animals plants or bacteria.

Another classification uses the geometrical shape of their capsid often a helix or an icosahedron or the. Having the form of threads or filaments. The virus obtains the lipid molecules from the cell membrane during the viral budding process.

Some viruses have an envelope of phospholipids and proteins. Animal viruses plant viruses fungal viruses and bacteriophages viruses infecting bacteria which include the most complex viruses. A basic structure of virus is nucleic acid core either dna or rna but not both surrounded by protein coat.

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An enclosing structure or cover such as a membrane. The envelope is made from portions of the hosts cell membrane. A virus is often housed in a protein coat or protein envelope a protective covering which allows the virus to survive between hosts.

A diagrammatic sketch of an icosahedral virus. A virus is an infectious non living particle that cannot survive on its ownit is considered to be non living because it cannot exist purely by itself.



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