OCR A Level Biology Course Notes¶

These revision notes cover the full OCR Biology A course, with AS as the first-year subset. Start with the overview that matches your route, then move into module hubs, topic pages, interactive revision tools, practical reference pages and syntheses.

Start Here¶

• AS Overview: First-year course structure and assessment.
• A Level Overview: Full-course structure, assessment pattern and topic map.
• Course Map: Open the full course map.

Popular Interactives¶

Most interactives are embedded in the relevant topic pages. These are a few good visual starting points.

• Fluid Mosaic Model: Explore how phospholipids, proteins, cholesterol and carbohydrate-bearing structures fit together in the membrane.
• DNA Structure: Move from one nucleotide to the full double helix so backbone structure and base pairing stay in one view.
• Meiosis: Step through meiosis I and meiosis II so crossing over, reduction division and chromatid separation stay distinct.