OCR A AS Biology

Cell structure
1. Cells and Organelles
2. Organelles Working Together
3. Prokaryotic Cells
4. How Microscopes Work
5. Using Microscopes
Biological Molecules
1. Water
2. Carbohydrates
3. Lipids
4. Proteins
5. Macromolecules and Polymers
6. Inorganic Ions
7. Biochemical Tests for Molecules
8. Separating Molecules
Nucleotides and Nucleic Acids
1. Nucleotides
2. Polynucleotides and DNA
3. DNA Replication
4. Genes and Protein Sunthesis
5. Transcription and Translation
Enzymes
1. Action of Enzymes
2. Factors Affecting Enzyme Activity
3. Enzyme Controlled Reactions
4. Cofactors and Enzyme Inhibition
Biological Membranes
1. Cell Membranes - The Basics
2. Cell Membranes and Signalling
3. Diffusion and Osmosis
4. Facilitated Diffusion and Active Transport
Cell Division and Cellular Organisation
1. The Cell Cycle and Mitosis
2. Sexual Reproduction and Meiosis
3. Stem Cells and Differentiation
4. Tissues, Organs and Systems
Exchange and Transport
1. Specialised Exchange Systems
2. Gas Exchange in Mammals
3. Ventilation in Mammals
4. Gas Exchange in Fish and Insects
5. Dissecting Gas Exchange Systems
Transport in Animals
1. Circulatory Systems
2. Blood Vessels
3. Heart Basics
4. Electrical Activity of the Heart
5. Haemoglobin
Transport in Plants
1. Xylem and Phloem
2. Water Transport
3. Translocation
4. Transpiration
Disease and the Immune System
1. Pathogens and Communicable Diseases
2. Defence Against Pathogens
3. The Immune System
4. Antibodies
5. Primary and Secondary Immune Responses
6. Immunity and Vaccinations
7. Antibiotics and Other Medicines
Biodiversity
1. Investigating Biodiversity
2. Genetic Diversity
3. Factors Affecting Biodiversity
4. Biodiversity and Conservation
Classification and Evolution
1. Classification Basics
2. Evolution of Classification Systems
3. Variation
4. Investigating Variation
5. Adaptations
6. Theory of Evolution
7. More on Evolution

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