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一、数形结合思想在进行DNA分子中碱基比例、基因表达和DNA分子半保留复制过程中的有关计算时,可巧用数形结合思想。如:在计算DNA分子中的碱基比例时,先画出DNA分子平面结构简图(如图1所示),其次将题目中的数量关系和图形结合,明确已知的碱基比例是占一条链的情况,还是占整个DNA分子的情况,最后在理清两条链碱基关系的基础上作答。在解答有关基因表达过程中的计算时,可结合图2,明确DNA分子中的碱基、RNA分子中的碱基、多肽中
First, the combination of ideas in the number of DNA molecules in the proportion of base, gene expression and DNA molecules in the process of semi-conservative replication of the calculation, you can count on the number of combination with the idea. Such as: in the calculation of the proportion of DNA molecules in the base, first draw a schematic diagram of DNA molecules planar structure (as shown in Figure 1), followed by the title of the quantitative relationship between the number and graphics, a clear known base ratio is accounted The case of a chain, or the case of the entire DNA molecules, and finally clear the basis of the relationship between the two bases on the answer. In the process of calculating the expression of the gene expression, combined with Figure 2, a clear DNA molecules in the base, RNA molecules in the base, the polypeptide