capsid proteins Nucleocapsids Some viruses have envelope surround the capsid

Capsid proteins nucleocapsids some viruses have

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capsid proteins = Nucleocapsids Some viruses have envelope surround the capsid composed of lipid, carbohydrates and proteins The lipid portion derived from host .Proteins are viral specific
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Structure of viruses Structure of viruses On the envelope Spikes(peplomers) -: Glycoproteins responsible for attachment to host cells(host specificity) . e.g :Influenza virus has two kinds of spikes, H (hemagglutinin) and N (neuraminidase)
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Arrangement of capsomers gives the virus structure its geometric symmetry. Viral nucleocapsids have two forms of symmetry: Polyhedral : in which the capsomers are arranged in 20 triangles that form a symmetric figure. Helical : in which the capsomers are arranged in a hollow coil that appears rod- shaped Complex viruses bacteriophage Morphology
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All human viruses that have a helical nucleocapsid are enclosed by envelope(outer membrane). There are no naked helical viruses. Viruses that have an icosahedral (polyhedral) nucleocapsid can be either enveloped or naked .
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Enveloped viruses can be transmitted by : Direct contact: blood or sexual contact
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  • Fall '19
  • nucleocapsid

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