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

但对于剩下0.1%，一个人可能有嘌呤而另一个人有鸟嘌呤。

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

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

The rules of base pairing dictate that adenine always pairs with thymine, and cytosine always pairs with guanine.

碱基配对规则规定嘌呤总是与啶配对，胞啶总是与鸟嘌呤配对。

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

DNA 由四种有机碱基组成：嘌呤、鸟嘌呤、胞啶和啶，即 A、G、C 和 T。

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：嘌呤、胞啶、鸟嘌呤和啶。

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——嘌呤、鸟嘌呤、胞啶和啶——这4种成分总是以特殊配对方式排列。

For example, you convert formaldehyde into a compound called formate, which helps make the nucleic acids adenine and guanine — two of the four building blocks of DNA.

举个例子，你把甲醛转化成一种叫做甲酸化物，它能帮助生成核酸嘌呤和鸟嘌呤——这是 DNA 四个组成部分中两个。

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——基因子母表中字母——由前面我们提到嘌呤、鸟嘌呤、胞吟和啶4种核苷酸组成。

All living organisms are built from DNA. It is made from four blocks of chemicals called adenine (A), cytosine (C), guanine (G) and thymine (T).

所有生物体都是由 DNA 构成。它由四种化学物质组成，称为嘌呤 (A)、胞啶 (C)、鸟嘌呤 (G) 和啶 (T)。

In the first stage, the energized electrons from chlorophyll are used to create two vital energy--carrying molecules: ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate).

在第一阶段，来自叶绿素激发电子被用来产生两种携带生命能量分子：ATP（三磷酸苷）和NADPH（烟酰胺嘌呤二核苷酸磷酸）。

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，分别是嘌呤、胞啶、鸟嘌呤与啶，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）附着于嘌呤或胞啶上——组成DNA序列四种主化学成分中两种，到底附着是哪种取决于涉及到基因种类。

It's composed of long strands of nucleotides, each made up of a sugar molecule, a phosphate group, and one of four nitrogen bases: adenine (A), thymine (T), cytosine (C), or guanine (G).

它由长链核苷酸组成，每条核苷酸链由一个糖分子、一个磷酸基团和四个氮碱基之一组成：嘌呤 (A)、啶 (T)、胞啶 (C) 或鸟嘌呤 (G)。