This was the first clue to the nature of viruses, genetic entities that lie somewhere in the grey area between living and non-living states. No virus has been cultivated in a cell-free medium. Tiny infectious microbes—from the virus that causes COVID-19 to waterborne bacteria—kill millions of people around the world each year. Animal viruses may enter cells by attaching to the surface. They are smaller than bacteria and have a much more simplified organization. THE NATURE OF VIRUSES infectious particles of mosaic virus to be of the same order of magnitude as hemoglobin molecules, namely, 30 pp in diameter. What do Viruses look like?
Viruses are unusual and different from other things in nature.
Viruses come in a variety of shapes
Some may be helical shape like the Ebola virus
Some may be polyhedral shapes like the influenza virus
Others have more complex shapes like bacteriophages
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