DNA needs proteins to read the information it contains and help run the cell. But the manufacture of proteins itself really doesn't necessarily depend on DNA, and that's because it contains the information about what order to stitch amino acids together.
Oh, and in living things as we see them now, the "other" nucleic acid never combines the properties of DNA and protein, and that's because it can actually preserve information in the order of bases in a linear molecule. lol
I love this thread. (This part is accurate)
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