一切生物都能把它的各种遗传性状传递给它的后代,而什么是遗传信息的载体,却是经过长期的观察研究,才搞清楚的。上世纪提出基因的概念,认为通过基因传递遗传信息。而基因是什么,却全然无知。本世纪初,人们致力于把基因物质化的研究。直到四十年代才发现一切生物的遗传物质都是核酸,而基因就是核酸分子上的功能单位。核酸有两种:一种叫脱氧核糖核酸(DNA),一种叫核糖核酸(RNA)。核酸是由核苷 All living things can pass on its various genetic traits to its descendants, and what is the carrier of genetic information is only made clear through long-term observation and study. The concept of genes was proposed in the last century, and genetic information was passed on by genes. What genes are, but totally ignorant. The beginning of this century, people are committed to the genetic material of the study. It was not until the 1940s that the genetic material of all living things was found to be nucleic acids, which are the functional units of nucleic acid molecules. There are two kinds of nucleic acids: one is called DNA, one is called RNA. Nucleic acids are nucleosides