RNA & DNA have arisen from the SAME Precursor Molecules: Contradicts with RNA to DNA hypothesis

The discovery, published April 1 in Nature Chemistry, suggests that the first living things on Earth may have used both RNA and DNA, as all cell-based life forms do now. In contrast, the prevailing scientific view -- the "RNA World" hypothesis -- is that early life forms were based purely on RNA, and only later evolved to make and use DNA.

The compound, thiouridine, likely present on Earth before life arose, and could have been a chemical precursor of the nucleoside building blocks of early RNAs and DNA.

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