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# Energy Carriers - Respiration ## Stage 1: Glycolysis (HL) * Takes place in the cytosol of the cell (the cytoplasm of the cell minus the cell organelles). * No oxygen needed - anaerobic process. **Steps:** 1. Glucose, a 6-carbon molecule, is converted to pyruvic acid, a 3-carbon molecule. 2. A...

# Energy Carriers - Respiration ## Stage 1: Glycolysis (HL) * Takes place in the cytosol of the cell (the cytoplasm of the cell minus the cell organelles). * No oxygen needed - anaerobic process. **Steps:** 1. Glucose, a 6-carbon molecule, is converted to pyruvic acid, a 3-carbon molecule. 2. A small amount of energy is released that is used to make 2 Adenosine Triphosphate (ATP) molecules. 3. The ATP is formed by using the energy in the glucose molecule to combine ADP (adenosine diphosphate) to a phosphate (P). 4. In glycolysis, glucose is only partially broken down. 5. This is why glycolysis produces only a low yield of energy. **Products:** * 2 Pyruvic acid (C3) * 2 ATP * NADH