Some representative viruses — size, morphology, ultrastructure and replication
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As a first step it will be advisable to define the various constituent parts of the virion. As already stated in the Introduction, all viruses contain nucleic acid, either ribonucleic acid (RNA) or deoxyribonucleic acid (DNA), but never both. The nucleic acid is contained within a coat made up of large numbers of similar protein subunits known as capsomeres. The whole package is called a nucleocapsid. The capsomeres themselves are composed of smaller particles known as structural units. In the case of the isometric viruses, icosahedral (twenty-sided) or near spherical, the capsomeres are arranged in a box-like form, called a capsid.
KeywordsVirus Particle Tobacco Mosaic Virus Nuclear Polyhedrosis Virus Viral Core Twofold Symmetry
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