IB Diploma Biology SL, topic A1
Molecules (Unity and diversity)
Molecules (Unity and diversity) covers two molecules that all life shares: water and the nucleic acids. A1.1 explains how hydrogen bonding gives water the properties that make it the medium for life. A1.2 explains how the structure of DNA and RNA lets genetic information be stored, copied and expressed in every living organism.
Revision notes
Worksheet
FlashcardsSubtopics
Work through them in order. Each one has notes, exam questions and flashcards, and a PDF of each.
- 1Water Spec A1.1IB Biology A1.1 Water: polarity, hydrogen bonds, cohesion, adhesion, solvent properties, and water vs air as a habitat.NotesQuestions 6Flashcards 15
- 2Nucleic acids Spec A1.2IB Biology A1.2 Nucleic acids: nucleotides, DNA and RNA structure, base pairing and the genetic code.NotesQuestions 5Flashcards 14
Whole topic
When you have done the subtopics: test yourself on everything, or print the lot.
