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Because it takes three units where there's only four choices at each position to have at least 20 unique combinations.
因为每个位点上仅有四种可能性,只有采用三个碱基一组,才能取得至少二十种不同的组合方式
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They have breakfast, they drink, and they advance typically to a battle song called the paeon which we have, what they sang.
他们吃早餐,喝酒,随即开始唱战歌,一种四音节的歌曲
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How many combinations of codons are there if there's three bases and four possibilities at each base?
那密码子的组合方式到底有几种呢,三个位点,每个位点四种选择
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For at least four decades, people have been building tools called debuggers.
在过去的至少四十年里,人们一直在做一种叫做调试器的工具。
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So in principle, in that election in 2000, there was at least four candidates, as it were, four things you could do with your vote.
原则上,在2000年那场大选中,应该有四个选举人,因为你可以投出四种选票
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And, this is a really clever reaction because titanium tetrachloride is a gas.
这是一个非常巧妙的反应,因为四氯化钛是一种气体。
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As I'll explain later in class, in Florida there used to be many, many, many varieties of oranges and now there are about four and there are commercials reasons for this occurring.
稍后我会详细解释,在佛罗里达州曾经有很多种类的橙子,而现在那里大概仅剩四种,这一切的发生归咎于商业上的原因
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As you may know, there's yet another organization where we could group this in units of four but for all intents and purposes-- there are a few nuances to it-- four is simply a multiplication of two.
也许你知道的,还有另外一种组织方式,我们可以四拍一组,但是不论出于什么动机或者目的,这其中的区别甚微,四拍就是两拍的简单相乘
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There are four different bases, which I'll talk about in a moment.
有四种不同的碱基,一会我们会讲到
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It's only got one of four possible choices at each position.
每个位点上都只有四种可能性
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One is that there's four different colors and so you can see red, blue, yellow, green here - four different colors and that's all there are, there aren't more than four.
一是这些梯阶有四种不同颜色,你可以看到红 蓝 黄 绿,恰恰只有四种不同颜色,不多不少
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The connective tissue is one of those four main types of tissue, they're supporting material - supporting tissues that surround other cells in the body and give the cell - and give the body much of its mechanical property.
结缔组织是四种主要组织类型中的一种,它们是支持物--是,包围在体内其它细胞周围的支持组织,并赋予身体大部分的机械性能
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Okay, so now we've seen four different combinations.
目前为止我们看到了四种组合
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x 4 x 4--possibilities, because I could have here, here, , , - 4 x 4 = 16.
x4x4种可能性,因为这有AGCU四种,这也是四种,4x4=16.
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While there are only four different bases that make up either RNA or DNA, and so the complexity of an RNA polymer is limited.
在RNA或DNA的构成中,只含四种不同的碱基,因此一个RNA分子的复杂程度是有限的
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In DNA there's only four colors, there's only four bases,.
在DNA中仅有四种颜色,只有四种碱基CTGA
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In RNA there's four bases.
在RNA中也只有四种
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Now remember that there were only four different colors in the cartoon of the DNA double helix that we talked about and I told you that those colors are really - represent the bases but there's five of them here.
现在要记住只有四种不同的颜色,在双螺旋DNA的卡通模型上出现,我们刚说过这个,我告诉你们的这些颜色,它们代表不同的碱基,不过有五种碱基
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