Metabolism.docx - Metabolism Pre-Lab Questions 1 Why is cellular respiration necessary for living organisms Cellular respiration is when the cells use

Metabolism.docx - Metabolism Pre-Lab Questions 1 Why is...

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Metabolism Pre-Lab Questions 1. Why is cellular respiration necessary for living organisms? Cellular respiration is when the cells use oxygen to breakdown the sugar molecules and store that energy in the form of ATP. It is important for organism which mainly depends on aerobic respiration for its survival. Cells cannot utilize the carbohydrate molecules for energy so its converted to ATP and then is utilized. Almost all the processes which happens in the body requires ATP to grow, divide, and fight against foreign particles. So without cellular respiration the cells will die finally leasing to the death of the organism. 2. Why is fermentation less effective than respiration? Fermentation occurs in the absence of oxygen and leads to partial oxidation of molecules like glucose. This process is not able to extract all the energy stored in glucose and so the number of ATP produced in fermentation is far less than that of aerobic respiration which is the complete breakdown of glucose. 3. What is the purpose of glycolysis? Glycolysis breaks down glucose into two pyruvate molecules and this can be used in either aerobic respiration or anaerobic respiration on the need of the cell for the organism. 4. How many ATP molecules are produced in aerobic respiration? How many ATP molecules are produced during fermentation and glycolysis? Aerobic respiration produces up to 38 molecules from one glucose. Fermentation produces about 2 ATP molecules from one glucose. Glycolysis also produces 2 ATP molecules.
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Experiment 1: Fermentation by Yeast Data Tables Table 1: Yeast Fermentation Data Tube Initial Gas Height (mm) Final Gas Height (mm) Net Change 1 6 mm 8 mm +2 mm 2 7 mm 8 mm +1 mm 3 7 mm 8 mm +1 mm 4 6 mm 7 mm +1 mm 5 8 mm 9 mm +1 mm Post-Lab Questions 1. Did you notice a difference in the rate of respiration between the various sugars? Did the artificial sugar provide a good starting material for fermentation? Yes, a small difference in the rate and extent of sugar metabolism will be seen when different types of sugars are used. The artificial sugar is a good starting material for fermentation but natural
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