Cholera is an infectious disease with diarrhoea caused by eating food or drinking water contaminated with a bacterium called Vibrio cholerae. Cholera was prevalent in the UK in the 19th century before modern water and sewage treatment systems eliminated its spread by contaminated water.
Different chemical reactions are used in combinations during chemical synthesis in order to obtain a desired product. In biochemistry, a consecutive series of chemical reactions (where the product of one reaction is the reactant of the next reaction) form metabolic pathways. These reactions are often catalyzed by protein enzymes.
11-14. Students work with a series of cards (showing word descriptions, photographs or equations) related to chemical reactions that are used as energy sources or for making new materials or that are important in biological systems. The cards help students to think about and discuss these uses.hemical reactions that are important in biological systems include. 1  Water and carbon dioxide reacting to form glucose and oxygen. 2  The conversion of glucose into carbon dioxide and water. 3  The reaction of haemoglobin and oxygen to form oxyhaemoglobin.