# evol: the origins of life on earth could be arisen from the same set of DNA and RNA precursor molecules

<< the first living things on Earth may have used both RNA (ribonucleic acid) and DNA (deoxyribonucleic acid), 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. >>

<< These new findings suggest that it may not be reasonable for chemists to be so heavily guided by the RNA World hypothesis in investigating the origins of life on Earth, >>

Ramanarayanan Krishnamurthy. Building blocks of DNA and RNA could have appeared together before life began on Earth. The Scripps Research Institute. April 1, 2019.

https://m.phys.org/news/2019-04-blocks-dna-rna-life-began.html  

Jianfeng Xu, Nicholas J. Green, et al. Prebiotic phosphorylation of 2-thiouridine provides either nucleotides or DNA building blocks via photoreduction. Nature Chemistry. doi: 10.1038/s41557-019-0225-x April 1, 2019.

https://www.nature.com/articles/s41557-019-0225-x