Bacteria have defences against viruses in the form of chemicals called restriction enzymes, which chop up foreign DNA.

细菌有一种对病毒的防御机制：一种叫做限制性内切酶的化学物质可以切断外源dna。

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The method USES fluorescence microscopy to image individual DNA molecules that have been divided into orderly fragments by so-called restriction enzymes.

该方法应用荧光显微术使单个DNA分子成像，这些单个的DNA分子已经被分成有序的片断，因而被称为限制性内切酶的识别序列。

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Large DNA molecules are first dissected with restriction enzymes to produce specific fragments.

首先用限制性内切酶将大的DNA分子切断，产生出特殊的片段。

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If you have DNA fragments, so this is DNA that you've cut up into fragments using restriction enzymes for example.

如果你有DNA片段,例如有一段你用限制酶,切割成片段的DNA

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Now another property of restriction enzymes is that they always cut the DNA in the same way.

限制性内切酶的另一个特性是,总是以同样的方式切割DNA

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Restriction enzymes are just a kind of enzyme, enzymes are protein molecules that make a chemical reaction go faster, and the chemical reaction that restriction enzymes do is cutting DNA.

限制性内切酶是一种酶,而酶是加速化学反应的蛋白质分子,限制性内切酶加速的化学反应,是切割DNA

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Arber shared the 1978 Nobel Prize for his discovery of restriction enzymes, catalyzing proteins that can cut DNA at precise points.

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