dna double helices structure dna双螺旋结构
Temperature oscillations or chemical changes should cause complete double helices 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。
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.
RNA分子能像DNA分子那样形成双链螺旋，通过沃森·克里克配对，两个螺旋的核苷链互补。
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