A yeast culture is respiring without oxygen. In a model of these conditions, each glucose molecule broken down produces two carbon dioxide molecules and two ethanol molecules.
The culture produces 180 carbon dioxide molecules.
Which pair gives the number of glucose molecules broken down and ethanol molecules produced?
90 glucose molecules and 90 ethanol molecules
90 glucose molecules and 180 ethanol molecules
180 glucose molecules and 180 ethanol molecules
180 glucose molecules and 90 ethanol molecules
42 exam-style questions on Edexcel GCSE Biology 8.3 Respiration, covering 8.3.1 Aerobic and anaerobic respiration. Each one has a worked solution and a mark scheme showing where the marks go.