IB Biology HL 1.2.5 Translation and polypeptide synthesis Question Bank
Practise IB Biology HL 1.2.5 by analysing translation at the ribosome and the mechanisms that produce a polypeptide.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Analyse codon–anticodon pairing and the movement of tRNA through ribosome binding sites.
- Explain how peptide bonds form and how the mRNA sequence determines amino-acid order.
- Evaluate a translation explanation by checking start/stop signals, direction and molecular roles.
D1.2.5—Translation question 1
[Maximum number: 4]
Proteins play essential roles in all forms of life.
Outline how mRNA is translated in the cytoplasm of a cell.
a. mRNA attaches to a ribosome
OR
translation is initiated by assembly of ribosome, mRNA and tRNA;
b. translation happens by a repeated cycle of events
OR
ribosome moves along mRNA;
c. tRNA carrying an amino acid binds to ribosome / to A/P site (of ribosome);
d. anticodon on tRNA binds codon on mRNA;
e. complementary base pairing links anticodon to codon/ensures the amino acid corresponds to the codon
OR
base sequence determines amino acid sequence due to complementary base pairing;
f. peptide bond links amino acid (on tRNA) to the peptide chain already assembled
OR
peptide bond links amino acids (attached to tRNAs) on the P and A sites;
g. polypeptide released from ribosome when stop codon is reached;
4 max
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