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  Section: Introduction to Botany » Respiration and Fermentation
 
 
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The ATP Molecule

 
     
 
Content
Respiration and Fermentation
  The ATP Molecule
  Respiration and Photosynthesis
  The Anaerobic and Aerobic Pathways
  Hydrogenation
  The Carbon Cycle

Note that the adenosine part of the ATP molecule has two parts: an adenine and the 5-carbon sugar ribose. Hence, another name for this molecule could be adenine ribose triphosphate. Adenosine triphosphate is the universal energy carrier molecule, and respiration can be considered an energy harvesting process.

In a simplified scheme, the phosphate group can be represented as , and the bond that links this group to the rest of the molecule can be shown as either __ , if a low-energy bond, or , if a high-energy bond. The ATP molecule, then, can be represented as shown in figure 10-3. ATP manufacture is a part of the respiration process in all organisms (figure 10-4).

A graphical way of representing ATP showing two high-energy bonds

 

Figure 10-3 A graphical way of representing ATP showing two high-energy bonds.
 
When a phosphate is added to adenosine diphosphate to make adenosine triphosphate, energy is invested. When a phosphate is broken away from ATP (thus returning it to a diphosphate), energy is liberated.
Figure 10-4 When a phosphate is added to
adenosine diphosphate to make adenosine triphosphate, energy is invested. When a phosphate is broken away from ATP (thus returning it to a diphosphate), energy is liberated.

 
     
 
 
     



     
 
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