| 09th February 2024 | Bibliography |
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The essentials about viruses in terms of virion structure (non-enveloped/naked capsid viruses versus enveloped viruses) and viral replication. We will also look at their scientific nomenclature.
Note: Drawings are not to scale.
A common ancestor, through an evolutionary process of more than 3 billion years, gave rise to organisms that today we group into three domains: Archaea, Bacteria and Eukarya. Eukarya includes animals, fungi, plants and protozoa.
Most authors believe that, at the time of existence of those common ancestors, viruses appeared from cells. Some other authors believe that at that point viruses already existed ‒ from even more ancient cells.
Some authors believe that viral nucleic acids had already appeared in the pre-cellular world.