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CAIE A-Level Biology 6.1.2 Adenine and Guanine Purines

Practise identifying adenine and guanine as double-ring purines, assigning their complementary DNA or RNA partners and separating ring count from hydrogen-bond count.

Syllabus
2028–2030
Course
Biology 9700
Level
AS

Exam points

  • classify adenine and guanine as purines with fused double-ring structures
  • pair adenine with thymine or uracil and guanine with cytosine in the correct nucleic acid
  • distinguish base ring number from the number of hydrogen bonds in each complementary pair

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