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# Preparatory Phase of Glycolysis The image describes the preparatory phase of glycolysis, a metabolic pathway that converts glucose into energy. **Steps in the Preparatory Phase:** The steps are numbered and correspond to specific enzymes in the process. 1. **Glucose phosphorylation (Hexokinase...

# Preparatory Phase of Glycolysis The image describes the preparatory phase of glycolysis, a metabolic pathway that converts glucose into energy. **Steps in the Preparatory Phase:** The steps are numbered and correspond to specific enzymes in the process. 1. **Glucose phosphorylation (Hexokinase):** Glucose is phosphorylated to form glucose-6-phosphate using ATP as energy source. 2. **Glucose-6-phosphate to Fructose-6-phosphate (Phosphohexose Isomerase):** Glucose-6-phosphate is isomerized to fructose-6-phosphate. 3. **Fructose-6-phosphate to Fructose-1,6-bisphosphate (Phosphofructokinase-1):** Fructose-6-phosphate is phosphorylated to fructose-1,6-bisphosphate using another ATP molecule. 4. **Fructose-1,6-bisphosphate to Glyceraldehyde-3-phosphate and Dihydroxyacetone phosphate (Aldolase):** Fructose-1,6-bisphosphate is cleaved into two 3-carbon sugars: glyceraldehyde-3-phosphate and dihydroxyacetone phosphate. 5. **Dihydroxyacetone phosphate to Glyceraldehyde-3-phosphate (Triose Phosphate Isomerase):** Dihydroxyacetone phosphate is isomerized to glyceraldehyde-3-phosphate, ensuring both products of the cleavage reaction can proceed through the next steps. **Diagram Explanation:** The diagram shows the chemical structures of the molecules involved in each step, along with the enzymes that catalyze the reactions. Arrows indicate the direction of the reaction and the molecules involved have structures with detailed chemical connections. ATP and ADP molecules are shown throughout the process to illustrate energy transfer. Additionally, the figure shows the priming and second priming reaction required for the preparation phase. Also the name of the enzyme is indicated next to each step.