BIOL 228 Lecture Notes - Lecture 21: Rhinovirus, Reverse Transcriptase, Monkeypox

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Nucleic acid (dna or rna) surrounded by . Protein coat (capsid: some viruses consist only of nucleocapsid, others have additional components: Protomers fit together as a spiral; shaped like hollow tubes with protein walls (ex. An icosahedron is a regular polyhedron with 20 equilateral faces and 12 vertices (20 triangular surfaces arranged to form an almost spherical structure) Ring or knob-shaped units made of 5 or 6 protomers. Hexamers (hexons): 6 subunit capsomers: complex capsids. Many viruses do not fit into the category of having helical or icosahedral capsids. Examples are the poxviruses (including vaccinia) and large bacteriophages *including t-even coliphages: t2, t4, t6) Some have additional structures that help the virion to attach to the host cell. Collar, tail sheath, plate, pins, tail fibers. Virion enzymes: it was first erroneously thought that all virions lacked enzymes, now known variety of virions have enzymes, some are associated with the envelope or capsid, ex.

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