1.Adenine will always bind with thymine and cytosine with guanine.

腺嘌呤总是与胸腺嘧啶结合，胞嘧啶与鸟嘌呤结合。

2.DNA is made of four organic bases: adenine, guanine, cytosine, and thymine, or A, G, C, and T.

DNA 由四有机碱基组成：腺嘌呤、鸟嘌呤、胞嘧啶胸腺嘧啶， A、G、C T。机翻

3.See, DNA is made up of four different building blocks called " bases" : adenine, cytosine, guanine, and thymine.

看，DNA 由四“碱基”的不同构件组成：腺嘌呤、胞嘧啶、鸟嘌呤胸腺嘧啶。机翻

4.It was known that DNA had four chemical components - called adenine, guanine, cytosine, and thiamine - and that these paired up in particular ways.

当时已经知道，DNA含有4化学成分——腺嘌呤、鸟嘌呤、胞嘧啶胸腺嘧啶——这4成分总是以特殊的配对方式排列。

5.The bases - the letters of the genetic alphabet - consist of the four nucleotides mentioned a page or two back: adenine, thiamine, guanine, and cytosine.

碱基——基因子母表中的字母——由前面我们提到的腺嘌呤、鸟嘌呤、胞嘧吟胸腺嘧啶4核苷酸组成。

6.Nucleotides of DNA are made out of a sugar deoxyribose, a phosphate, and one of the four nuclear bases: adenine, cytosine, guanine, and thymine or A, C, G, T for short.

DNA的核苷酸由脱氧核糖、磷酸以及四个核碱基之一组成，分别是腺嘌呤、胞嘧啶、鸟嘌呤与胸腺嘧啶，或简A、C、G、T。

7.This attaches methyl groups (a carbon atom and three hydrogens) to either adenine or cytosine, two of the four chemical bases that form the alphabet of DNA, depending on the gene involved.

该作用可以让甲基（由一个碳原子三个氢原子组成）附着于腺嘌呤或胞嘧啶上——组成DNA序列的四主化学成分中的两，到底附着的是哪取决于涉及到的基因类。

8.Nucleotides of DNA are made up of a sugar - deoxyribose, a phosphate, and one of the four nucleobases - adenine, cytosine, guanine, and thymine - or A, C, G, T for short.

DNA的核苷酸由一分子单糖-脱氧核糖、一分子磷酸与四核碱基之一的腺嘌呤（A）、胞嘧啶（C）、鸟嘌呤（G）或胸腺嘧啶（T）组成。