Cellular Respiration

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  • Cellular Respiration
    • Organisms get the energy needed from food.
      • Energy in food is expressed in units of calories. A calorie is the amount of energy needed to raise the temperature of 1 gram of water by 1 degree Celsius.
        • the Calorie is used in food labels and is called kilocalorie, or 1000 calories.
          • Cells use all sorts of molecules for food, including fats, proteins, and carbohydrates.
            • Carbohydrates and proteins contain approximately 4 Calories of energy per gram, while fats contain approximately 9 Calories.
              • Cells don't simply burn food and release energy as heat. They break down food molecules gradually, capturing a little bit of chemical energy at key steps.
                • This allows the cells to use the energy stored in the chemical bonds of foods like glucose to produce compounds such as ATP that directly power the activities of the cell.


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