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HOST RANGE - multiplication VIRAL SIZE All viruses are...

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HOST RANGE Most viruses are fairly specific as to what species they are capable of infecting. Most are limited  to only one species or several closely related species. There are even viruses that attack only  bacteria. These are known as bacteriophages, or just phages.    The main factors in determining host range are:    1. The requirements of the virus for specific attachment sites on the host cell. The outer surface  of the virus must interact with specific receptor sites of the surface of the host cell. These  receptors will be on the plasma membranes of animal cells and on the cell wall, fimbriae or  flagella of a bacterium.     2. The availability within the cells of the potential host of the cellular factors required for  viral 
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Unformatted text preview: multiplication. VIRAL SIZE All viruses are small, so small that electron microscopes are needed to view them. A few of the very largest viruses are roughly the same size as the very smallest of bacteria. Viruses are measured in nanometers. To refresh your memory: Centimeter (cm) = 0.01 meter (2.54 cm = 1 inch) Millimeter (mm) = 0.001 meter (25.4 mm = 1 inch) Micrometer ( μ m) = 0.001 mm (25,400 μ m = 1 inch) Nanometer (nm) = 0.001 μ m (25,400,000 nm = 1 inch) Viruses range from 20 to 1000 nanometers in length....
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