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7.2 Glycolysis page 210 Glycolysis Glycolysis is the first stage of cellular respiration Glycolysis occurs with or without oxygen (during both aerobic and anaerobic respiration) Glycolysis takes place in the cytoplasm of the cell During glycolysis glucose is split in two to form 2 pyruvate molecules Glycolysis cont . . . . Key Events a) 2 ATP are used b) Oxidation – reduction reaction 2 NAD+ 2NADH + 2H+ a) 4 ATP are made b) 2 pyruvate molecules are made Summary IN glucose OUT 2 ATP, 2 pyruvate, 2 NADH, 2 H+ Glycolysis cont . . . . Reactants Products Glucose 2 pyruvate 2 NAD+ 2 NADH 2 ATP 2 ADP 4 ADP 4 ATP Net equation for glycolysis 1 glucose + 2 ADP + 2 Pi + 2 NAD+ 2 pyruvate + 2 ATP + 2 NADH + 2 H+ Glycolysis cont . . . Glycolysis is not a highly efficient energy-harnessing mechanism. Glycolysis only transfers about 2.2% of the energy in 1 glucose Most of the energy is still stored in the 2 pyruvate molecules and the 2 NADH molecules The energy produced by glycolysis is not enough to support multi-cellular organism, it is however enough to support some single celled organism. Complete Questions 1 – 3 on page 212