Biology 9700 · AS & A Level · Structure of nucleic acids and replication of DNA

Structure of nucleic acids and replication of DNA — practice question

Which row accurately identifies the characteristics of DNA and RNA molecules?

  • ADNA and RNA contain both purine and pyrimidine bases ✓; DNA and RNA both contain a pentose sugar ✓; hydrogen bonds form between bases in some RNA ✓
  • BDNA and RNA contain both purine and pyrimidine bases ✓; DNA and RNA both contain a pentose sugar ✓; hydrogen bonds form between bases in some RNA ✗
  • CDNA and RNA contain both purine and pyrimidine bases ✓; DNA and RNA both contain a pentose sugar ✗; hydrogen bonds form between bases in some RNA ✓
  • DDNA and RNA contain both purine and pyrimidine bases ✗; DNA and RNA both contain a pentose sugar ✓; hydrogen bonds form between bases in some RNA ✗

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