来自《耶鲁大学开放课程：生物医学工程探索 第3集 第3集》

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  is a complicated biological
  是个极其复杂的生物过程
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  process that's occurring all the time.
  而且每时每刻都在发生
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  Before, we talked about
  在之前的课上
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  how do you know what messenger RNA to make,
  我们说到如何判断mRNA的具体序列
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  how do you know what RNA to copy from a DNA template?
  如何判断RNA从DNA模板复制了什么
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  Well you do that by this Watson-Crick base pairing,
  依据的是沃森克里克碱基互补配对原则
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  so I know if I have (A)(C)(G)(C)(G)(A)
  如果给我一个ACGCGA的序列
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  I know what messenger RNA to make from that
  就能知道转录出的mRNA会是什么
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  because I have to satisfy these base pairing rules.
  因为我必须满足碱基配对原则
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  It's more complicated in making protein from an RNA strand
  而从一条单链RNA翻译为蛋白
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  and that complication is called the genetic code.
  这个过程更为复杂 称之为遗传密码
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  You know that messenger RNA is read
  mRNA是按每三个碱基组成一个密码子