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2667#
发表于 2011-10-15 18:08
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PCR—the polymerase chain reaction—is a crucial tool. The DNA amplification technique is used in genome sequencing, forensics and the diagnosis of various diseases.
To give researchers more genetic material to work with, a PCR instrument repeatedly heats and cools an original biological sample. Which gives enzymes a chance to replicate the DNA millions of times so it can be more easily analyzed.
请问,黑体it指代的是enzyme还是DNA啊?谢谢。^_^ |
它对自己说,这一切都不是你自己。谁也不能为你自己建造一座你必须踏着它渡过生命之河的桥。 |
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