Yeast cells can respire with or without oxygen. With oxygen, about 30 molecules of ATP are made from each molecule of glucose. Without oxygen, about 2 molecules of ATP are made from each molecule of glucose.
Calculate the ratio of ATP made per glucose molecule with oxygen to ATP made per glucose molecule without oxygen. Give your answer in its simplest form.
113 exam-style questions on OCR GCSE Biology 1.3 Respiration, covering 1.3.1 Cellular respiration supplies ATP, 1.3.2 Aerobic and anaerobic respiration, 1.3.3 Sugars and carbohydrates, 1.3.4 Amino acids and proteins, and 1.3.5 Fatty acids and lipids. Each one has a worked solution and a mark scheme showing where the marks go.