DNA and RNA Nucleotides Composition
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Questions and Answers

Which nitrogenous base is found in both DNA and RNA?

  • Thymine
  • Uracil
  • Adenine
  • Guanine (correct)

    • What is the key structural difference between the pentose sugars in DNA and RNA?

  • The presence of a hydrogen atom
  • The presence of a hydroxyl group
  • The chemical groups attached to the carbon (correct)
  • The number of carbons in the sugar

    • Which nitrogenous base is present only in DNA and not in RNA?

  • Adenine
  • Cytosine
  • Uracil
  • Thymine (correct)

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