Why is glycolysis described as having an investment phase and a payoff phase?

Why is glycolysis described as having an investment phase and a payoff phase? 






A) It both splits molecules and assembles molecules.
B) It attaches and detaches phosphate groups.
C) It uses glucose and generates pyruvate.
D) It shifts molecules from cytosol to mitochondrion.
E) It uses stored ATP and then forms a net increase in ATP.








Answer: E


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