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有生命物质最重要的化学组成当然是蛋白貭和核酸,我主要想讲的也就是这些,其中尤其是核酸,一方面因为一二年来,我们已经知道了不少有关蛋白貭和核酸方面令人鼓舞的消息,另一方面或许是出于自私,因为我已与它们打了二十多年交道。所有细胞组成中,蛋白貭是最多变化和最丰富的,是极复杂的高分子物貭,但是依靠现代技术的帮助,已经得到许多有关它们结构的知识。氨基酸是蛋白貭的组成单元,大约有20种,它们都有相同的通式结构:
The most important chemical components of living matter are, of course, proteins and nucleic acids. I mainly want to talk about these, especially nucleic acids. On the one hand, for a year or two ago, we already knew a lot about proteins and nucleic acids The message of encouragement may on the other hand be selfish, for I have dealt with them for more than two decades. Of all the cellular components, protein 貭 is the most diverse and abundant and is a very complex polymer, but with the help of modern technology, much has been learned about their structure. Amino acids are the constituent units of protein 貭, there are about 20 kinds, all of them have the same general structure: