Text A Nucleotides and Nucleic Acids
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        Nucleotides are vital to the operation and the reproduction of cells. Each nucleotide contains three different kinds of components: a five-carbon sugar (ribose or deoxyribose),a nitrogen-containig base (either a single-ringed pyrimidine or a doubleringed ......（本文共 1748 字）     [阅读本文] >>