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Politics : Evolution
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To: Brumar89 who wrote (50957)3/27/2014 9:53:57 PM
From: TigerPaw1 Recommendation  Read Replies (1) of 69300
 
viruses containing only RNA.
RNA with a protein coat. But yes, I'm still studying the RNA world. That's why I go through this process.

It seems that in the time that cells on earth became DNA dependent they lost some of the RNA only chemicals which would otherwise be necessary in an RNA only world. In particular, the RNA comes in two formats, Once which they call the "Negative" strands contains instructions and is more stable but it doesn't actually cause cytoplasm to make proteins. The "Positive" strand variety can immediately code for proteins when injected into a cell, but are more fragile.

The Negative strand viruses must also contain a tiny extra Positive strand virus which creates a small mechanism to convert the rest of the Negative RNA into Positive RNA that copies the virus (including the extra strand).

That really shows the increasing complexity that arose as the RNA world evolved into the DNA world.
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