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

Structure of nucleic acids and replication of DNA — practice question

A DNA molecule is composed of two polynucleotide strands. Which description is correct?

  • AThe percentage of cytosine is $50\%$ of that of guanine in the whole molecule.
  • BThe percentage of cytosine is the same as that of guanine in each strand.
  • CThe percentage of cytosine is the same as that of guanine in the whole molecule.
  • DThe percentage of cytosine is the same in each strand of the molecule.

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