How is amino acid racemization an indicator of dna stability?
If you’re referring to racemization as the fact that certain biological molecules have taken specific chiral shapes (IE sugars are exclusive to dextrorotatory, while amino acids levorotatory) then the best way I can think of it is the saying “if it isn’t broken, don’t fix it.” If you think of DNA as a stable molecule, then you’d assume that it has not gone through many (drastic) changes over the years of evolution. Well, lets say through chance that particular enzymes (specified through DNA) happen to make successful amino acids (to make further enzymes/proteins) in one chiral shape. They would have an edge and continue to be produced because they’re successful. After a while more and more amino acids would be produced this way, leading to more and more amino acids with this particular chiral shape. Eventually this chiral shape would become dominant. Now, if there was something wrong with this DNA, it if were unstable, something should happen to change balance of the chiral shape of th
