NATS 1670 Lecture Notes - Viral Envelope, Chromosome, Cell Surface Receptor

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Diversity of viruses: viruses are highly diverse in overall morphology and in the nature of their genetic material, different structure and size, different method of replication, host range. The virus particle: nucleic acid genome, dna or rna, protein coat (capsid, protection, entry into the cell. Viruses can be either: enclosed by just a shell of protein called a capsid (nonenveloped, or enclosed by both a capsid and a membrane-like envelope (enveloped, on the outside: contains protein important for attachment to the host cells. Viral genome: rna or dna, segmented or non-segmented. Lysogenic growth cycle: viral genes are incorporated into the host"s chromosome and are transmitted to the host"s daughter cells. Lytic replication cycle: viral particles are made and released from the cell, usually resulting in the death of the host, lytic replication results in a new generation of virus particles and the death of the host cell.

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