In an experiment, isolated muscle cells receive glucose continuously. When oxygen concentration falls, energy transfer decreases but does not stop. Which explanation is most accurate?
The cells switch to fermentation and completely oxidise glucose into ethanol and water
The cells switch to photosynthesis and store light energy in newly produced glucose
The cells stop all glucose reactions and use carbon dioxide as their only energy source
The cells use anaerobic respiration, producing lactic acid by incomplete glucose oxidation
51 exam-style questions on AQA GCSE Biology 4.2 Respiration, covering 4.2.1 Aerobic and anaerobic respiration, 4.2.2 Response to exercise, and 4.2.3 Metabolism. Each one has a worked solution and a mark scheme showing where the marks go.