Energy and Life

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  • Energy and Life
    • Cells use a compound called adenosine triphosphate(ATP).
      • ATP is used for active transport across a cell membrane, protein synthesis, and muscle contraction.
      • ATP consists of adenine, a 5-carbon sugar called ribose, and three phosphate groups. The phosphate groups are the key to ATP's ability to store and release energy.
    • Adenosine diphosphate (ADP) is a compound that looks like ATP, except that it has two phosphate groups instead of three.
      • Storing Energy: When a cell has energy available, it can store small amounts of it by adding phosphate groups to ADP molecules, producing ATP.
      • Releasing Energy: 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.


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