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Kreb Cycle - The Krebs cycle is not a type of motorbike. The Kreb Cycle is the technical term for the "combustion chamber", the area where sugar finally reaches in the tree. Here the energy that was trapped in the bonds that held the carbon dioxide and water together are released in an orderly sequence. Every time a bond is released, the chemical is changed. Every time the change occurs energy is released and carbon dioxide and water are given off. So, now we are back to the original building blocks. This process of releasing the energy is called respiration. Respiration in the presence of molecular oxygen gives off carbon dioxide and water. Respiration without molecular or free oxygen is called fermentation and the product given off is ethyl alcohol, the only alcohol we can drink. See “Photosynthesis” and “Respiration”.