Year 12 biology
Every topic for the year is below, arranged by the term it is taught. Choose a term to show only that term: each topic has a lesson video, worked questions and practice at three levels.
Summer term
- BiologyCell recognition and the immune systemAntigens and how cells recognise self and non-self, phagocytosis, the roles of T cells and B cells, antibodies, vaccination and herd immunity, HIV and the use of monoclonal antibodies and ELISA.100 questionsLesson video
- BiologySurface area to volume ratio and gas exchangeHow surface area to volume ratio affects exchange, and gas exchange in single-celled organisms, insects, fish, the human lungs and plant leaves, including adaptations for reducing water loss.100 questionsLesson video
- BiologyDigestion and absorptionThe digestion of carbohydrates, lipids and proteins by enzymes, the roles of bile salts and micelles, and how the products of digestion are absorbed across the ileum by diffusion and co-transport.100 questionsLesson video
- BiologyMass transport in animals and plantsHaemoglobin and the oxygen dissociation curve, the structure and function of the heart and blood vessels, tissue fluid, and the transport of water and organic substances in plants by the xylem and phloem.100 questionsLesson video
- BiologyMutation, meiosis and genetic diversityGene mutations and their effects, meiosis and how it produces genetic variation, the link between genetic diversity and natural selection, and how adaptations arise and are selected for.100 questionsLesson video
- BiologySpecies, taxonomy and biodiversityDefining a species and the classification system, phylogenetic relationships from DNA and protein evidence, measuring biodiversity and the index of diversity.100 questionsLesson video