(685746977) Homework 2 - Bianca Sainvil Professor Shiryn...

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Bianca Sainvil Professor: Shiryn Sukhram Bio 106 11/18/15 Chapter 6 How Cells Harvest Chemical Energy 1. Compare the processes and locations of cellular respiration and photosynthesis. Explain why it is accurate to say that life on Earth is solar- powered. Breathing occurs. It’s used in cellular respiration and removes CO2. Cellular respiration banks energy in ATP molecules and the human body uses energy from ATP for all its activities. The cells tap energy from electrons using organic fuels to oxygen. Plants convert CO2 and H2O to their own organic molecules and Produce 02. Sunlight creates food for the plants which becomes energy which is eventually consumed by humans. 2. Explain how breathing and cellular respiration are related. Breathing- C02 and 02 are exchanged between lungs and that air. In cellular respiration, cells use O2 to break down fuel. This then releases CO2 as a waste product. 3. Provide the overall chemical equation for cellular respiration. Compare the efficiency of this process in cells to the efficiency of a gasoline automobile engine. a. C6H12O6 + 6 o2 --> 6 CO2 + 6 H2O + ATPs In cellular respiration there’s 40% efficiency and Gasoline is 25%. 4. Explain how the human body uses its daily supply of ATP. In the human body to maintain life there’s constant use sustain activities. These activities use 75% of energy. 5. Define a kilocalorie and relate it to a food calorie. Kilocalorie: Represents the amount of energy required to raise the temperature of a liter of water one degree centigrade at sea level. The word calorie is commonly used to refer to a unit of food energy. It actually represents 1000 true calories of energy. 6. Explain how the energy in a glucose molecule is released during cellular respiration. During cellular respiration, electrons are transferred from glucose to oxygen, releasing energy. Oxygen attracts electrons very strongly, and an electron loses potential energy when it falls to oxygen.
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7. Explain how redox reactions are used in cellular respiration. Redox reactions are used in cellular respiration by having a loss of electrons from one substance which is called oxidation. Also the addition of electrons to another substance is called reduction. 8. Describe the general roles of dehydrogenase, NADH, the electron transport chain, and oxygen in cellular respiration.
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