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We've concluded this part of our discussion on energy and cellular respiration, specifically by addressing redox reactions, NAD+ and glycolysis. You should be able to update "What Do We Know So Far?" with the following:

• Where glycolysis occurs in the cell
• The reactants and products involved in glycolysis
• The energy input and output of glycolysis
• What is meant by substrate-level phosphorylation
• How much ATP is produced in the absence of oxygen

If you're comfortable with these concepts, it's time to complete the discussion of cellular respiration in the next tutorial.