But for the remaining .1%, one person might have an adenine where another person has a guanine.

但对于剩下0.1%，一个人可能有腺而另一个人有鸟。

SIRT1 depends on a molecule called NAD (Nicotinamide adenine dinucleotide), and NAD, in turn, depends on the substance called NMN.

SIRT1合成取决于一种叫NAD（酶）分子，而NAD合成则取决于一种叫NMN物质。

Guanine always pairs with cytosine and adenine always pairs with thymine.

鸟是与胞嘧啶配对，腺是与胸腺嘧啶配对。

NAD, short for nicotinamide adenine dinucleotide, is a coenzyme that occurs naturally in human cells.

NAD， 即烟酰腺二核苷酸缩写，是一种天然存在于人体细胞酶。

These are the letters of RNA or the letters of DNA. Cytosine, guanine, adenine and uracil in RNA.

这些是核糖核酸（RNA）或脱氧核糖核酸（DNA）字母。在RNA，它们分别是胞嘧啶、鸟、腺和尿嘧啶。

And so in RNA, it's adenine, guanine, uracil and cytosine.

在核糖核酸，它们是腺、鸟、尿嘧啶和胞嘧啶。

So you've got cytosine, guanine, adenine and uracil.

所以你有胞嘧啶、鸟、腺和尿嘧啶。

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

看，DNA 由四种称为“碱基”不同构件组成：腺、胞嘧啶、鸟和胸腺嘧啶。

If you look at DNA the bases that we have are cytosine, guanine, adenine and thymine.

如果你看脱氧核糖核酸，我们有碱基是胞嘧啶、鸟、腺和胸腺嘧啶。

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种化学成分——腺、鸟、胞嘧啶和胸腺嘧啶——这4种成分是以特殊配对方式排列。

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——基因子母表字母——由前面我们提到腺、鸟、胞嘧吟和胸腺嘧啶4种核苷酸组成。

Cytosine, guanine, adenine and thymine in DNA. The other difference here is in DNA. We actually have a double helix so those attach together.

在脱氧核糖核酸（DNA），含有胞嘧啶、鸟、腺和胸腺嘧啶。这里一个不同之处在于DNA，我们实际上拥有是双螺旋结构，因此这些碱基对会相互配对连接。

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、胞嘧啶、鸟与胸腺嘧啶，或简称A、C、G、T。

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（由一个碳原子和三个氢原子组成）附着于腺或胞嘧啶上——组成DNA序列四种主化学成分两种，到底附着是哪种取决于涉及到基因种类。

And the reason it's called a TATA Box is you have a thiamine adenine thiamine adenine and on the other side you'd have TATA backwards complimentary to that.

它被称为TATA框原因是，你有一段序列包含胸腺嘧啶（T）、腺（A）、胸腺嘧啶（T）、腺（A），而在另一侧，你会看到与这段序列互补反向序列，即TATA反向互补序列。