Learning objective
A1.2.3—Sugar-phosphate bonding
Nucleotides join by condensation reactions to form a continuous sugar-phosphate backbone, leaving bases exposed to carry sequence information along each strand.
- Syllabus
- First assessment 2025
- Objective
- A1.2.3
- Level
- SL
Concept essentials
- Sugar-phosphate bonding should be described using precise molecular vocabulary.
- Structure and information must be kept separate: backbones provide continuity while bases carry sequence meaning.
- Exam answers should match the command term and avoid adding unsupported extra claims.
