Nature and Structure of viruses

Created by roxy975 

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16 terms

viruses

not cells, dependent on their cellular hosts, metabolically inert outside of a susceptible cell; "fluid poison"

Protomer

protein subunit that may be assembled into capsomeres

Capsomeres

morphological subunits from which the virus capsid is built

Capsid

the protein shell, or coat, that encloses the nucleic acid genome

Virion

the complete infective virus particle

Defective virus

a virus that cannot replicate because it lacks a full complement of viral genes; replication occurs in mixed infections with a helper virus

pseudotype

during replication in co-infected cells, the genome of one virus may become encapsidated in the heterolgous protein coat encoded by the second virus

pseudovirion

during viral replication, the capsid sometimes encloses the host nucleic acid rather than viral nucleic acid, such particles look like ordinary virus particles when observed by electron microscope, but do not replicate

episome

autonomous extra-chromosomal genetic element

Provirus

viral DNA that is integrated into host cell chromosome in a latent state and must be activated before it is transcribed, leading to production of progeny virions

penton

capsomeres located at the vertices of icosahedral virions

Poxvirus

the only complex DNA virus

Capsid

responsible for structural symmetry of the virus particle, protects, facilitates attachment, some contain enzymes which play roles in the infection process, also determines the antigenic characteristics of the virus

Retrovirus

only virus that has a diploid genome

Monopartite

the genome of all DNA viruses of vertebrates is ____________ (all viral genes contained in a single chromosome).

Enveloped

__________ viruses are more susceptible to environmental factors such as gastric acidity, dying and bile salts.

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