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viruses - Coggle Diagram

- - - - Very small, not observable with a light microscope. • Very large viruses approach size of bacterial cell. • Genome: DNA or RNA, 1 or more fragment. • 1000 bases to 2.5 megabases. • 7 proteins to 1000 proteins. Capsid. • Protein subunit called capsomeres. • 1 or more different protein. • Self-assembly or requires the host
        
        example of helical symmetry- Length of rod dependent on length of nuclei acid strand. • Width is dependent on size and packaging of capsomeres. • Tobacco Mosaic Virus (TMV)
        
        Example of icosahedral symmetry • 20 triangular faces + 12 vertices (i.e.corners). • Simplest and most effective arrangement. • Fewest capsomeres required • Icosahedral symmetry requires less energy to assemble vs helical requires 1 protein
        
        Example of complex shape
        • Icosahedral heal + helical tail
- - - - • I. BCI: double-stranded (ds) DNA viruses. (Central dogma)
      - • II. BCII: single-stranded (ss) DNA viruses
      - • III. BCIII: dsRNA viruses
      - • IV. BCIV: positive-sense (+)RNA viruses
      - • V. BCV: negative-sense (–)RNA viruses
      - • VI. BCVI: reverse-transcribing RNA viruses
      - • VII. BCVII: reverse-transcribing dsDNA viruses