You are studying the stability of two double stranded nucleic acid samples. They contain double stranded polynucleotide of identical sequence and length and contain only G and C residues. The only difference is that one is RNA and one is DNA. You have forgotten to label your stock tubes and now you are unsure which tube contains the DNA sample and which the RNA sample. To distinguish, you perform a melting experiment and measure the amount of unfolded nucleic acid at different temperatures. You carry the experiment out at pH 10. Which tube likely contains DNA