How does the glycolosis cycle work with teh ETC and cellular respiration?
Cell Phone Questions September 19th, 2008
blueeyedbaby9492 asked:
approval, even I do not know if all these processes go together in any sense, but im completely lost in my bio-class, so that what is the cycle glycolosis and how to prepare the adenosine triphosphate or ADP or any . . and what is respriation phone and what makes the work so as to and… on a great demand but the much needed aid.
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September 22nd, 2008
Cellular respiration can be divided up into 3 stages:
Glycolysis
Krebs Cycle (Citric Acid Cycle)
Electron Transport Chain (ETC) and oxidative phosphorylation
Glycolysis: harvests chemical energy by oxidizing glucose to pyruvate. Glycolysis is a catabolic pathway during which six-carbon glucose is split into 2 three- carbon sugars,which are then oxidized and rearranged to produce two pyruvate molecules. Each reaction is catalyzed by specific enzymes dissolved in the cytosol.
No carbon dioxide is released as glucose is oxidized to pyruvate. All the carbon can be accounted for in the 2 molecules of pyruvate. It occurs under aerobic or anaerobic conditions. The process occurs in two phases: The energy investment phase and the energy yielding phase.
The Krebs Cycle: completes the energy yielding oxidation of organic molecules. Most of the chemical energy originally stores in glucose still remains in the two pyruvate molecules produced by glycolysis. The fate of pyruvate depends upon the presence or absence of oxygen. If oxygen is present, pyruvate enters the mitochondrion where it is completely oxidized by a series of enzyme-controlled reactions. The junction between glycolysis and the Krebs Cycle is the formation of Acetyl-CoA. The Acetyl-CoA combines with oxaclacetic acid to begin the cycle. This process occurs in the mitochondrial matrix.
The Electron Transport Chain: is made of electron carrier molecules embedded in the inner mitochondrial membrane. Each successive carrier in the chain has a higher electronegativity than the carrier befor it, so the electrons are pulled down hill toward the oxygen.
Except for ubiquinone (Q), most of the carriers are protein containing a non -protein cofactor. The cofactors alternate between an oxidized and reduced state as they accept and donate electrons.
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