10.19.2008
象牙塔中的叛逆者
不相信自己的勇气和意志,永远也做不成将军。自己才是一只箭,若要它坚韧,若要它锋利,若要它百步穿杨,百发百中,磨砺它,拯救它的都只能是自己。世间最珍贵的不是‘得不到’和‘已失去’,而是现在能把握的机遇。”
Posted on :
09:45:00
Tags:
象牙塔、大学生、勇气、意志
Both RNA and DNA are composed of repeated units. The repeating units of RNA are ribonucleotide monophosphates and of DNA are 2'-deoxyribonucleotide monophosphates. Both RNA and DNA form long, unbranched polynucleotide chains in which different purine or pyrimidine bases are joined by N-glycosidic bonds to a repeating sugar-phosphate backbone.