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by gus_massa
1895 days ago
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When the chains are very small, you can start to hope you are lucky and get the correct one. The ocean has 1.3 * 10^18 m^3 (3.5 * 10^20 gallons). If we assume 1 random DNA chain per cubic meter, that is like 4^30, so it's enough to have all the chains with 30 bases. (With 1 molecule per cm^3, you get like 10 more bases in locations for random chains.) It's actually more complicated, because shallow part of the sea or fumes near ocean rigs may have more concentration, and 1 molecule per cubic meter is a very low concentration. Anyway, extrapolating to 1 base is too extreme. Also, they had a nice fit for DNA based life, and they discuss the RNA World hypothesis, but it's not clear that the fit for DNA can be extrapolated to the RNA or whatever was used before. (There is a recent paper that propose a mix of RNA and DNA instead of a pure RNA word. We still don't know.) |
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