D1.2.8—Genetic code features Topic Practice
D1.2.8—Genetic code features Topic Practice

IB Biology syllabusBiology SL/HLFirst assessment 2025
Practise interpreting codons, degeneracy and start or stop signals to predict how mRNA sequence affects polypeptide structure.
How this is tested
- explain how triplet codons determine the amino acid order in a polypeptide
- apply degeneracy to predict when a base change may leave a protein unchanged
- calculate the number of bases needed for a peptide of a given length
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