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It is proposed that the earliest life forms contained RNA as their genetic material. Does this...

It is proposed that the earliest life forms contained RNA as their genetic material. Does this make sense to you? Currently. only viruses appear to contain an RNA genome. What do you propose this means for the theory of evolution?

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Ans. It is said that earliest form of life was having RNA as genetic material because RNA is capable of carrying out a number of roles like it act as genetic material as well as enzyme called ribozyme( RNA having catalytic activity).Viruses having RNA as genetic material provides them lot of advantages like it is less stable than DNA which is necessary for pathogenic characteristics of a virus.Secondly it is more reactive and can also be single stranded .So, all these conditions make RNA a suitable genetic material for viruses. There is progressive hypothesis that suggest that viruses evolved from genetic elements which enabled them to replicate and transmit in semi autonomous type .

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