Viruses

... at once. There were probably many cell-like structures that were quasi-alive, possessing some of the characteristics of life, but not all of them. Viruses are a good example: they have no metabolism, but they do reproduce. Or prions: no one would argue that prions are alive in any meaningful sense, ...

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When somebody is studying the phenomenon of viruses ,he can see that when viruses are not coming in contact with a host organism, they are a sum of chemical compounds that not fulfill the criteria to be considered as life.While on the other hand ...

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... dominant description of biological evolution. The cases in point include the origin of complex RNA molecules and protein folds; major groups of viruses; archaea and bacteria, and the principal lineages within each of these prokaryotic domains; eukaryotic supergroups; and animal phyla. In each ...

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I know that bacteria and viruses can mutate in the presence of selective pressure in order to survive, and once the selective pressure is removed, they usually revert back to the way they were before the mutation because of the increased ...

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I know that bacteria and viruses can mutate in the presence of selective pressure in order to survive, and once the selective pressure is removed, they usually revert back to the way they were before the mutation because of the increased ...

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