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IB Biology HL D1.2.7 Complementary Base Pairing Questions

In IB Biology HL D1.2.7, tRNA anticodons pair with complementary mRNA codons. Specific amino-acid attachment to each tRNA helps ensure the correct amino acid is added.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Use complementary pairing to identify the mRNA codon matched by a tRNA anticodon.
  • Explain how a specific amino acid is attached to its matching tRNA to support correct amino-acid addition.

IB Biology HL D1.2.7 Complementary Base Pairing Questions question 1

[Maximum number: 2]

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 D1.2.7 Complementary Base Pairing Questions question 1 — IB Biology HL

Explain how living organisms ensure that the amino acid linked to this tRNA molecule is always aspartic acid.

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