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晋江文学城网页文字不能复制

  Genes carry biological information that must be copied accurately for tran□□ission to the next generation each time a cell divides to form two daughter cells. TWo central biological questions arise from these requirements: how can the information for specifying an organi□□ be carried in chemical form, and how is it accurately copied? The discovery of the structure of the DNA double helix was a landmark in twentieth-century biology because it immediately suggested answers to both questions, thereby providing a molecular explanation for the problem of heredity. We discuss these answers briefly in this section, and we shall examine them in much more detail in subsequent chapters