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 … 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, beer Organism: AspergillusProduct of fermentation: lactic acidExample: soy sauce Organism: AcetobacterProduct of fermentation: Acetic acidExample: vinegar Question 3:While … 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, … 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 … Read more