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A sample of human DNA is subjected to increasing temperature until the major fraction exhibits optical density changes due to disruption of its helix (melting or denaturation). A smaller fraction is atypical in that it requires a much higher temperature for melting. This smaller, atypical fraction of DNA must contain a higher content of

  1. Adenine plus cytosine

  2. Cytosine plus guanine

  3. Adenine plus thymine

  4. Cytosine plus thymine

  5. Adenine plus guanine 


in Biochemistry by

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b. Cytosine plus guanine