This 10 part biology study guide can be used as part of student's GCSE biology study or by anyone studying biology. Part 1 is cell biology. It includes information on cell structure, microscopes, specialised cells, chromosomes, cell division and transport in cells (diffusion, osmosis and active transport).Part 2 is tissues, organs & organ systems. It looks at cell organisation (including plant cell organisation), the circulatory system and the respiratory system.Part 3 is enzymes & diges