·2,447,543篇论文数据，部分数据来源于NoteExpress
Being as an important hereditary substance, DNA has the double helix, the two bonds composing the double helix are mating and connecting with each other through the purine and the pyrimidine.
作为重要的遗传物质，DNA为双螺旋结构，组成双螺旋的两条链由嘌呤和嘧啶通过氢键配对联系。
youdao
应用推荐
模块上移
模块下移
不移动