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IB Biology HL A1.2.11 Hl Directionality of Rna and Dna Questions

Explain how 3′–5′ phosphodiester bonds define strand ends and how the two DNA strands run antiparallel. State that RNA is synthesized and translated in the 5′ to 3′ direction.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain how 3′–5′ phosphodiester bonds create the 5′ and 3′ ends of a nucleic-acid strand.
  • Describe DNA strands as antiparallel, with one running 5′ to 3′ and the other 3′ to 5′.
  • State that RNA is synthesized and translated in the 5′ to 3′ direction.

IB Biology HL A1.2.11 Hl Directionality of Rna and Dna Questions question 1

[Maximum number: 1]

The diagram shows a nucleic acid, with some of the bases indicated.

Figure for Question IB Biology HL A1.2.11 Hl Directionality of Rna and Dna Questions question 1 — IB Biology HL

Identify the terminal indicated by Y on the diagram.

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