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CAIE A-Level Biology 6.2.2 Universal Genetic Code and Codons

Practise reading non-overlapping codons in the stated direction, converting template DNA to mRNA and applying start, stop and degeneracy rules without implying ambiguity.

Syllabus
2028–2030
Course
Biology 9700
Level
AS

Exam points

  • read non-overlapping three-base codons in the required 5′ to 3′ direction
  • convert between template DNA, coding DNA and mRNA before using a codon table
  • explain degeneracy as multiple codons for one amino acid while each codon has one meaning

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