Energy and Life

Energy and Life 8.1
Grade 9 

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  • Created by: Miguel
  • Created on: 10-02-13 16:49
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  • Energy and Life
    • Chemical Energy and ATP
      • Living things use chemical fuels. One of the most important compounds that cells use to store and release energy is adenosine triphosphate
        • Adenosine diphosphate (ADP) is a compound that looks almost like ATP, except that it has two phosphate groups instead of three. When a cell has energy available, it can store small amounts of it by adding phosphtate groups
          • ATP consiists of adenine, a 5-carbon sugar called ribose, and three phosphate groups
            • Energy from ATP powers other important events in the cell, including the synthesis of proteins and responses to chemical signals at the cell surface. It is more efficient for cells to keep only a small supply of ATP at hand. Instead, cells can regenerate  ATP from ADP as needed by using the energy in foods like glucose.
            • Cells can release the energy stored in ATP by the controlled breaking of the chemical bonds between the second and third phosphate groups. ATP can easily release and store energy by breaking and re-forming the bonds between its phosphate groups. This characteristic of ATP makes it exceptionally useful as a basic energy source for all cells
        • Cells can release the energy stored in ATP by the controlled breaking of the chemical bonds between the second and third phosphate groups. ATP can easily release and store energy by breaking and re-forming the bonds between its phosphate groups. This characteristic of ATP makes it exceptionally useful as a basic energy source for all cells
        • Energy from ATP powers other important events in the cell, including the synthesis of proteins and responses to chemical signals at the cell surface. It is more efficient for cells to keep only a small supply of ATP at hand. Instead, cells can regenerate  ATP from ADP as needed by using the energy in foods like glucose.
    • Heterotrophs and Autotrophs
      • Organisms that obtain food by consuming by consuming other living things are called heterotrophs. Some heterotrophs get their food by eating plants such as grasses. Other heterotrophs obtain food from plants indirectly by feeding on plant-eating animals. Other heterotrophs obtain food by absorbing nutrients from decomposing organisms in the environment
      • Organisms that make their own food are called autotrophs. Nearly all life on Earth depends on the ability of autotrophs to capture energy of sunlight and store it in molecules that make up food. The process by which autotrophs use the energy of sunlight  to produce high-energy carbohydrates that can be used as food is known as photosynthesis
        • In the process of photosynthesis, plants convert the energy of sunlight into chemical energy stored in the bonds of carbohydrates

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Hanifati

COOL :P

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