At A Level, Biology is studied as an individual subject. The course is based on 6 modules, three studied for at AS Level (normally in your first year) and three more to get the full A2 grade, usually sat in the second year of study. The Biology course contains in each year elements of biochemistry (e.g. studying the uses and synthesis of carbohydrates and proteins and other molecules), physiology (e.g. the structure of bacteria and viruses, or the human kidney) and ecology (e.g. foodwebs).