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Ch 3 A2.1 Origins of cells: complete notes
Neat, exam-ready notebook-style notes for Ch 3 A2.1 Origins of cells, following the IB Diploma syllabus, SL and HL. This chapter is part of the complete Biology Notes for IB Diploma Students (SL and HL): All 40 Topics.
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Free preview: Ch 3 A2.1 Origins of cells notes
A quick look at the chapter from our IB Diploma Biology notes. The full chapter notes have the detailed explanations, diagrams and practice questions with answers.
Topics in this chapter
- What you must be able to do
- Early Earth and what counts as living
- The challenge of explaining the origin of cells
- Evidence for the origin of carbon compounds
- Evaluating the experiment
- Membrane-bound compartments and the first genetic material
- The last universal common ancestor
“I can” checklist: what you must be able to do
- I can describe early Earth and explain why carbon compounds could form.
- I can discuss what makes something living and why viruses are non-living.
- I can evaluate the Miller–Urey experiment (strengths and limitations).
- I can explain vesicle formation and the case for RNA as the first genetic material.
- I can give the evidence for LUCA and for vents, and explain how dates are estimated.
What is inside the full chapter notes
- Concept notes with 8 worked examples
- Miller–Urey, vesicle, LUCA, timeline and vent diagrams
- Common mistakes; investigation (IA) ideas
- 15 Paper 1A-style MCQs, explained
- 3 Paper 2-style structured questions with mark schemes (one data-based)
- Quick-reference sheet and "I can" checklist
What you get in the pack
- All 40 topics of IB Diploma Biology for students taking Standard Level or Higher Level (first assessment 2025): water, nucleic acids, the origin of cells, cell structure, viruses, diversity and classification, evolution and speciation, conservation, carbohydrates, lipids and proteins, membranes, organelles, cell specialization, gas exchange, transport, muscle and motility, adaptation and niches, enzymes and metabolism, cell respiration, photosynthesis, chemical and neural signalling, integration of body systems, defence against disease, populations and communities, transfers of energy and matter, DNA replication, protein synthesis, mutation and gene editing, cell division, gene expression, water potential, reproduction, inheritance, homeostasis, natural selection, stability and change, climate change
- Every syllabus statement covered in order, each marked SL or HL, with clear notes, tables and diagrams drawn for these notes
- Worked examples in every topic: calculations and model answers that show how to earn the marks
- Original Paper 1A-style multiple-choice questions with explained answers, plus Paper 2-style structured and data-based questions with full mark schemes (no past-paper reprints)
- Common mistakes and investigation (internal assessment) ideas for every topic
- Quick-reference sheet and an "I can" checklist at the end of every topic
- Colour PDF and a black and white copy of every chapter for printing
- Independent notes for IB Diploma students; not endorsed by or affiliated with the International Baccalaureate Organization (IBO)
All chapters in this pack
- Ch 1 A1.1 Water
- Ch 2 A1.2 Nucleic acids
- Ch 3 A2.1 Origins of cells
- Ch 4 A2.2 Cell structure
- Ch 5 A2.3 Viruses
- Ch 6 A3.1 Diversity of organisms
- Ch 7 A3.2 Classification and cladistics
- Ch 8 A4.1 Evolution and speciation
- Ch 9 A4.2 Conservation of biodiversity
- Ch 10 B1.1 Carbohydrates and lipids
- Ch 11 B1.2 Proteins
- Ch 12 B2.1 Membranes and membrane transport
- Ch 13 B2.2 Organelles and compartmentalization
- Ch 14 B2.3 Cell specialization
- Ch 15 B3.1 Gas exchange
- Ch 16 B3.2 Transport
- Ch 17 B3.3 Muscle and motility
- Ch 18 B4.1 Adaptation to environment
- Ch 19 B4.2 Ecological niches
- Ch 20 C1.1 Enzymes and metabolism
- Ch 21 C1.2 Cell respiration
- Ch 22 C1.3 Photosynthesis
- Ch 23 C2.1 Chemical signalling
- Ch 24 C2.2 Neural signalling
- Ch 25 C3.1 Integration of body systems
- Ch 26 C3.2 Defence against disease
- Ch 27 C4.1 Populations and communities
- Ch 28 C4.2 Transfers of energy and matter
- Ch 29 D1.1 DNA replication
- Ch 30 D1.2 Protein synthesis
- Ch 31 D1.3 Mutation and gene editing
- Ch 32 D2.1 Cell and nuclear division
- Ch 33 D2.2 Gene expression
- Ch 34 D2.3 Water potential
- Ch 35 D3.1 Reproduction
- Ch 36 D3.2 Inheritance
- Ch 37 D3.3 Homeostasis
- Ch 38 D4.1 Natural selection
- Ch 39 D4.2 Stability and change
- Ch 40 D4.3 Climate change