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RNA was a key ingredient in primordial soup that led to life
latimes.com/news/science/sciencenow/la-sci-sn-rna-life-20130519,0,7718358.story
"How did we go from a lifeless Earth with no oxygen to a planet teeming with life and that essential element? Scientists at the Georgia Institute of Technology have found one crucial clue: iron and RNA."

Complex Biochemistry Possible at Origins of Life on Earth
dailygalaxy.com/my_weblog/2013/05/complex-biochemical-processes-possible-at-origins-of-life-on-earth.html
"A new study shows that RNA is capable of catalyzing electron transfer under conditions similar to those of the early Earth."

RNA with iron(II) as a cofactor catalyses electron transfer
nature.com/nchem/journal/v5/n6/full/nchem.1649.html
"Mg2+ is essential for RNA folding and catalysis. However, for the first 1.5 billion years of life on Earth RNA inhabited an anoxic Earth with abundant and benign Fe2+."

Origin of Life: Power Behind Primordial Soup Discovered
sciencedaily.com/releases/2013/04/130404122234.htm
"Researchers at the University of Leeds may have solved a key puzzle about how objects from space could have kindled life on Earth."

DNA vs RNA
diffen.com/difference/DNA_vs_RNA
"The main difference between DNA and RNA is the sugar present in the molecules."

In The Prebiotic Kitchen
blogs.discovermagazine.com/loom/2009/05/13/in-the-prebiotic-kitchen/#.UZ51iGRgYRG
"To explain the origin of life, scientists seek to explain the origin of its components."