Temperature oscillations or chemical changes should cause complete doublehelices to come apart, each then rebuilding the whole as fresh nucleotides link on.
温度和化学变化会使双股链分解，然后各核苷酸再重新形成整体继续连接。
2
RNA molecules form double stranded helices, just as do DNA molecules, by Watson Crick pairing of nucleotides on the two complementary strands of the helix.