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碱基
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{| class="https://image.baidu.com/search/detail?ct=503316480&z=0&ipn=d&word=%E7%A2%B1%E5%9F%BA&step_word=&hs=0&pn=6&spn=0&di=7077204560107798529&pi=0&rn=1&tn=baiduimagedetail&is=0%2C0&istype=0&ie=utf-8&oe=utf-8&in=&cl=2&lm=-1&st=undefined&cs=379715741%2C1252547724&os=2300767153%2C3775465794&simid=4260346635%2C776107726&adpicid=0&lpn=0&ln=1762&fr=&fmq=1650286675507_R&fm=&ic=undefined&s=undefined&hd=undefined&latest=undefined©right=undefined&se=&sme=&tab=0&width=undefined&height=undefined&face=undefined&ist=&jit=&cg=&bdtype=0&oriquery=&objurl=https%3A%2F%2Fgimg2.baidu.com%2Fimage_search%2Fsrc%3Dhttp%3A%2F%2Fbkimg.cdn.bcebos.com%2Fpic%2F50da81cb39dbb6fd526650f34b6abc18972bd507999a%26refer%3Dhttp%3A%2F%2Fbkimg.cdn.bcebos.com%26app%3D2002%26size%3Df9999%2C10000%26q%3Da80%26n%3D0%26g%3D0n%26fmt%3Dauto%3Fsec%3D1652878683%26t%3Db5dae0b12af2e22ef7c37736f63cda81&fromurl=ippr_z2C%24qAzdH3FAzdH3Fkwthj_z%26e3Bkwt17_z%26e3Bv54AzdH3Ftpj4AzdH3F%25Ec%25la%25AB%25Em%25Ba%25AE%25E0%25Ad%25B8%25Ec%25lF%25BAAzdH3F8a8bn8l&gsm=7&rpstart=0&rpnum=0&islist=&querylist=&nojc=undefined" style="float:right; margin: -10px 0px 10px 20px; text-align:left"|<center>'''碱基'''<br><imgsrc=" https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fbkimg.cdn.bcebos.com%2Fpic%2F50da81cb39dbb6fd526650f34b6abc18972bd507999a&refer=http%3A%2F%2Fbkimg.cdn.bcebos.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=auto?sec=1652878683&t=b5dae0b12af2e22ef7c37736f63cda81" width="280"></center><small> 圖片來自百度</small> |}
'''碱基'''，在化学中本是“碱性基团”的简称。有机物中大部分的碱性基团都含有氮原子，称为含氮碱基，氨基（-NH2）是最简单的含氮碱基。
碱基，在生物化学中又称核碱基、含氮碱基，是形成核苷的含氮化合物，核苷又是核苷酸的组分。碱基、核苷和核苷酸等单体构成了核酸的基本构件。