题目

英语翻译
Structurally DNA is a polynucleotide.A formal between polynucleotides and proteins may therefore be perceived.Ploynucleotides are the products of nucleotide condensation,just as proteins are produced by the polymerization of amino acids.This similarity of structures is an important element which facilitantes the transfer of genetic information between these two distinct classes of macromolecules.The structure of nuclcotides and their constituent purine and pyrimidine bases are examined in the text.
The base composition of DNA varies considerably among species,particularly prokaryotes,which have a range of 25% -75% in adenine-thymine content.This range narrows with evolution,reaching limiting vatues of 45%-53% in mammals.
In addition to the four common bases,adenine,guanine,thymine,and cytosine,which occur in DNA from all sources,DNA isolated from many plant and animal tissues contains small amounts of the base 5-methylcytosine.Methylated derivatives of the bases are al

提问时间：2021-01-02

答案

DNA在结构上是一种多核苷酸.因此,它会作为一种介于多核苷酸和蛋白质之间的物质被感知到.多核苷酸是核苷酸凝结的产物.就像蛋白质是由氨基酸聚合而成的一样.这种类似的结构是一种非常重要的元素,它可以促进两个级别界...