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。

So the caffeine doesn't even need to compete with the adenosine to fit into those receptors.

所以咖啡因不用和腺嘌呤核苷竞争受体。

That “form” is called ATP, if you're familiar with that.

如果你熟悉这种形式话，它名字叫做 ATP（腺嘌呤核苷三磷酸）。

Then it starts to make more, using a bunch of different chemical reactions.

身体利用很多不同化学反应开始制造更多腺嘌呤核苷三磷酸。

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

但对于剩下0.1%，一个人可能有腺嘌呤而另一个人有鸟嘌呤。

The Nitrogenous bases are of four different types: Adenine, Guanine, Cytosine and Thymine.

含氮碱基有四种不同：腺嘌呤、鸟嘌呤、胞嘧啶和胸腺嘧啶。

When you exercise, your body uses up its main source of energy, ATP, within a few seconds.

当你锻炼时候，你身体在几秒钟内便耗尽了其能量主要来源，即腺嘌呤核苷三磷酸。

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

碱基配对规则规定腺嘌呤总是与胸腺嘧啶配对，胞嘧啶总是与鸟嘌呤配对。

The series of reactions that generate more ATP in muscles do produce extra protons, which lowers the pH in your muscles.

肌肉中形成更多腺嘌呤核苷三磷酸系反应确实产生了额外质子，这会降低肌肉中酸碱值。

So there's a molecule inside your brain called adenosine and it plugs into little receptors inside your brain and makes you feel tired.

大脑中有一个分子物叫做腺嘌呤核苷，这个物质会和大脑里受体结合，让人困意绵绵。

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：腺嘌呤、胞嘧啶、鸟嘌呤和胸腺嘧啶。

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：腺嘌呤、鸟嘌呤、胞嘧啶和胸腺嘧啶，即 A、G、C 和 T。

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——腺嘌呤、鸟嘌呤、胞嘧啶和胸腺嘧啶——这4种成分总是以特殊配对方式排。

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——由前面我们提到腺嘌呤、鸟嘌呤、胞嘧吟和胸腺嘧啶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，称为腺嘌呤 (A)、胞嘧啶 (C)、鸟嘌呤 (G) 和胸腺嘧啶 (T)。

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合物，它能帮助生成核酸腺嘌呤和鸟嘌呤——这是 DNA 四个组成部分中两个。

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（三磷酸腺苷）和NADPH（烟酰胺腺嘌呤二核苷酸磷酸）。

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，分别是腺嘌呤、胞嘧啶、鸟嘌呤与胸腺嘧啶，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）附着于腺嘌呤或胞嘧啶上——组成DNA序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。

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核苷酸由一分子单糖-脱氧核糖、一分子磷酸与四种核碱基之一腺嘌呤（A）、胞嘧啶（C）、鸟嘌呤（G）或胸腺嘧啶（T）组成。