Adenosine Triphosphate (ATP)

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Adenosine Triphosphate (ATP)

• universal energy molecule
• Its why we eat.
• Structure
• Adenine, a N base
• Ribose, a 5 C sugar
• Chain of 3 phosphates

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How does ATP work?

• A phosphate is transferred to another molecule
• iP transfer is enzyme controlled
• Phosphorylated molecule becomes more reactive

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How does ATP work?

• Make substrates more reactive.
• Make uphill, building reactions a bit more
  feasible
• Exergonic hydrolysis of iP is coupled to
  endergonic process.

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Regeneration of ATP

• Amount of ATP in any cell at any moment is
  surprisingly small
• Average bacteria cell, lt 5 million, only enough
  to sustain activity for a second or two.
• Human body has enough ATP on hand to last about
  20 seconds.
• ATP supplies must be continually replenished
  (thats why we eat, and breathe)!

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Cellular Respiration

• Process by which cells extract energy from food
• Literally its about using bond energy
  (electrons) to regenerate ATP
• May be anaerobic or aerobic

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