IB Biology HL 2.1.8 Genetic-code degeneracy and reading frames Question Bank
Practise IB Biology HL 2.1.8 by analysing reading frames and the consequences of genetic-code degeneracy.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Explain how degeneracy allows different codons to encode the same amino acid.
- Analyse reading-frame and codon data to predict effects on a polypeptide.
D1.2.8—Genetic code features question 1
[Maximum number: 4]
There is a relationship between form and function in the diversity of molecules and of systems.
Describe the relationship between codons and polypeptide structure.
a. a codon is a triplet of bases of mRNA;
b. (a codon) codes for/ is translated into one amino acid;
c. one codon (AUG) initiates the translation
OR
AUG codes for Methionine/Met;
d. 3 codons (UAA, UAG and UGA) are stop codons;
e. one codon in mRNA matches/pairs with anticodon in tRNA
OR
complementary base pairing between tRNA and mRNA (in translation);
f. genetic code is degenerate
OR
more than one codon/multiple codons can code for one amino acid;
g. order of codons determines order of amino acids/primary structure of polypeptide/protein;
b. Allow codons code for/are translated into
amino acids.
4
Marking guidance:
max
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