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IB Biology HL D1.2.17 Hl Translation Initiation Questions

Explore how the ribosome assembles at AUG and organizes initiator tRNA and subsequent tRNA movement through A, P and E sites in IB Biology HL D1.2.17.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain that translation begins when the small ribosomal subunit binds mRNA at the start codon AUG before the large subunit joins.
  • Identify the P site as the entry location for initiator tRNA and distinguish A-site arrival from E-site exit.
  • Use ribosome diagrams to trace A/P/E site organization and the order of tRNA movement during initiation and early elongation.

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Study D1.2.17 (HL)—Translation initiation conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL D1.2.17 Hl Translation Initiation Questions question 1

[Maximum number: 3]

The structure of a transfer RNA (tRNA) molecule is shown in the diagram. The attached amino acid, which is aspartic acid, is indicated by the arrow.

Figure for Question IB Biology HL D1.2.17 Hl Translation Initiation Questions question 1 — IB Biology HL

During translation, three binding sites for tRNA molecules are used. Outline how each of these binding sites is used.

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