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let's solve this. Glycolysis is a metabolic pathway that converts glucose into pyruvate. It occurs in the cytoplasm and does not require oxygen, making it an anaerobic process. Step 1: Definition and Location. Glycolysis is the process where one molecule of glucose (a six-carbon compound) is broken down into two molecules of pyruvate (three-carbon compounds). This process takes place in the cytoplasm of the cell. Step 2: Energy Investment Phase. In this phase, ATP is used to activate glucose. Glucose is phosphorylated to form glucose-6-phosphate, using one ATP molecule. Glucose-6-phosphate is isomerized to fructose-6-phosphate. Fructose-6-phosphate is phosphorylated to form fructose-1,6-bisphosphate, using another ATP molecule. Fructose-1,6-bisphosphate is split into two three-carbon molecules: dihydroxyacetone phosphate (DHAP) and glyceraldehyde-3-phosphate (G3P). DHAP can be converted to G3P, resulting in two G3P molecules. Step 3: Energy Payoff Phase. In this phase, energy is produced. Each G3P molecule is oxidized, and a phosphate group is added, forming 1,3-bisphosphoglycerate. NAD+ is reduced to NADH in this process. A phosphate group from 1,3-bisphosphoglycerate is transferred to ADP, producing ATP and 3-phosphoglycerate (substrate-level phosphorylation). 3-phosphoglycerate is isomerized to 2-phosphoglycerate. Water is removed from 2-phosphoglycerate, forming phosphoenolpyruvate (PEP). A phosphate group from PEP is transferred to ADP, producing another ATP and pyruvate (substrate-level phosphorylation). Step 4: Net Results. At the end of glycolysis, one molecule of glucose yields: 2 pyruvate molecules 2 net ATP molecules (4 ATP produced, but 2 ATP are used in the investment phase) 2 NADH molecules The pyruvate can then enter further metabolic pathways depending on the presence or absence of oxygen. Got more? Send 'em 📸