21 cell size and scale view cell size scale

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21 Cell Size and Scale
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22 Genome + Capsid = Nucleocapsid Capsid subunits = capsomeres joined to one another (patches of a quilt) to make capsid Viruses made up of core of nucleic acid surrounded by a layer of protein ( genome ) ( capsid ) Terminology Envelope = flexible lipid-bilayer membrane outside the capsid +/- Spikes
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Envelopes = Cell membranes = phospholipid bilayer Virus Fine Structure
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24 Structure of the plasma membrane of a cell
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25 Cell membranes are phospholipid bilayers
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26 Structure of phospholipids
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27 Fluid Mosaic Model
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28 Diagram of a cell membrane
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29 The plasma membrane movie Cell membrane : exocytosis & endocytosis
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30 Maturation and release of virus by budding from CM
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31 HIV budding from a white blood cell
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32 Virus Structure Influenza Virus HIV Adenovirus Virus Tobacco Mosaic Virus Bacteriophage Virus Bacterium
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33 Virus Properties • Genome -DNA or RNA -Single or Double stranded • Shape —spherical, cylindrical, or complex • Envelope -some do; some don’t -lipid bilayer • Usually infect cells by attaching to a specific receptor
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