Cellular Respiration

Question 6:Photograph 1 shows the activities by two individuals, P and Q.(a) (i) Based on Photograph 1, identify the respiration that occurs in the muscles of individuals P and Q.(ii) State the products of respiration in P and Q.(b) During the 100-metre sprint on Sports Day, a pupil experienced muscle cramps and had to stop … Read more

Question 1:What are the uses of alcohol fermentation products? Answer:Ethanol is used in the production of beer and wine. Carbon dioxide is used in breadmaking to help the dough rise. Question 2:Why do muscles carry out cellular respiration that produces lactic acid during vigorous training? Answer:To provide the energy needed as well as enabling an … Read more

Question 1:State where the process of fermentation usually occurs. Answer:Human muscle cells, some bacteria, yeasts and plants. Question 2:Give three examples of microorganisms and food produced by the fermentation process. Answer:Organism: SaccharomycesProduct of fermentation: CO2, ethanolExample: wine, beerOrganism: AspergillusProduct of fermentation: lactic acidExample: soy sauceOrganism: AcetobacterProduct of fermentation: Acetic acidExample: vinegar Question 3:While helping your … Read more

Question 1:State the meaning of aerobic respiration. Answer:Aerobic respiration is the breakdown of glucose in the presence of oxygen to produce chemical energy. Question 2:Suggest another substrate apart from glucose that can be used by cells for cellular respiration. Answer:Fructose, galactose. Question 3:State the word equation for aerobic respiration. Answer:Glucose + oxygen —> carbon dioxide … Read more

Question 1:Give five examples of the necessity of energy in a metabolic process. Answer:• Maintaining body temperature at the optimal temperature of 37 °C.• Muscle contractions to enable movement.• Cell division whereby new cells are produced for growth and development.• Absorption of digested food through active transport.• Synthesis of lipids, hormones, proteins and enzymes. Question … Read more

Question 1:Diagram below shows a type of organelle found in muscle cells.A biochemical reaction occurs in the organelle.(a)(i) Name this organelle. [1 mark](ii) Explain why membrane W is in the form of numerous folded layers. [2 marks](b) The biochemical reaction that occurs in this organelle is summarized as follows:(i) Name gas R. [1 mark](ii) Name product … Read more