Silvestru

I'm no expert but I was always convinced that various proteins and amino acids were present in earth's oceans before any life evolved. I don't think it has to contradict with the fact that in today's world its DNA that produces proteins.

DNA

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Which came first, DNA or protein?

There is Miller-Urey experiment

https://en.wikipedia.org/wiki/Miller–Urey_experiment

Did you hear about it?

If you will heat, pass current (spark in experiment, in the real world thunderbolt, lightning), cool down, then repeat, mixture of gases such as CH₄, CO₂, H₂O, NH₃, HCN, H₂, N₂, O₂.. after a while there will be created the all kinds of organic molecules, amino acids, proteins, DNA. e.g. you can make C₅H₅N₅ (adenine) from 5 HCN.