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Gaokao Biology Practice Question

1．（ 6分）关于 DNA和RNA的叙述，正确的是（ ）

  1. A.DNA有氢键， RNA没有氢键
  2. B.一种病毒同时含有 DNA和RNA
  3. C.大肠杆菌和酵母菌中既有 DNA也有 RNA
  4. D.叶绿体、 线粒体和核糖体都含有 DNA

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