WJEC Biology for A2 Level: Revision Workbook

Q4 [AO1, AO2, M] a) Aerobic respiration can yield a theoretical maximum 38 moles of ATP from one mole of glucose. One mole of glucose contains 2880 kJ of energy, and the hydrolysis of ATP liberates 30.6 kJ per mole. i) State precisely where each step in aerobic respiration takes place in animal cells. (3) ......................................................................................................................................................................................................................................................................................................................................... ......................................................................................................................................................................................................................................................................................................................................... ......................................................................................................................................................................................................................................................................................................................................... ii) Calculate the energy efficiency of aerobic respiration. Show your working. (2) Answer ....................................................................................................................................................................................................... b) Anaerobic respiration theoretically yields much less energy, with the efficiency around 2%. Describe anaerobic respiration in animals, explaining why this value is probably much higher. (3) ......................................................................................................................................................................................................................................................................................................................................... ......................................................................................................................................................................................................................................................................................................................................... ......................................................................................................................................................................................................................................................................................................................................... ......................................................................................................................................................................................................................................................................................................................................... ......................................................................................................................................................................................................................................................................................................................................... 18 | WJEC Biology for A2 Level: Revision Workbook | Unit 3 Energy, Homeostasis and the Environment Copyright: Sample material