Glycolysi3 - glyceraldehyde-3-phosphate (GAP) and the other...

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Glycolysis Step 3: Phosphofructokinase In the third step of glycolysis, fructose-6-phosphate is converted to fructose- 1,6- bi sphosphate (FBP). Similar to the reaction that occurs in step 1 of glycolysis, a second molecule of ATP provides the phosphate group that is added on to the F6P molecule. Figure %: Step 3. The enzyme that catalyzes this reaction is phosphofructokinase (PFK). As in step 1, a magnesium atom is involved to help shield negative charges. Step 4: Aldolase The final step of the first stage of glycolysis utilizes the enzyme aldolase, which catalyzes the cleavage of FBP to yield two 3-carbon molecules. One of these molecules is called
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Unformatted text preview: glyceraldehyde-3-phosphate (GAP) and the other is called dihydroxyacetone phosphate (DHAP). Figure %: Step 4. GAP is the only molecule that continues in the glycolytic pathway. As a result, all of the DHAP molecules produced are further acted on by the enzyme triphoshpate isomerase (TIM), which reorganizes the DHAP into GAP so it can continue in glycolysis. At this point in the glycolytic pathway, we have two 3-carbon molecules, but have not yet fully converted glucose into pyruvate....
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This note was uploaded on 01/27/2012 for the course BIOLOGY BSC1005 taught by Professor Rodriguez during the Winter '09 term at Broward College.

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Glycolysi3 - glyceraldehyde-3-phosphate (GAP) and the other...

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