Write the reaction of the first irreversible step of glycolysis. Why is the reaction irreversible? Explain by calculating the value of equilibrium constant for this reaction using Table 8.1 of Unit 8 of the Biochemistry course.
In glycolysis there are three irreversible steps. Since gluconeogenesis is glycolysis in reverse, you can imagine that some roadblocks occur at the irreversible steps of the glycolysis pathway. The irreversible steps of the glycolysis pathway release a lot of energy when they occur. In contrast, performing these irreversible steps in the opposite direction during gluconeogenesis requires a lot of energy, as the energy needed is equal to the energy that was released in the forward reaction. Since the goal of gluconeogenesis is to produce emergency sources of energy when you haven’t eaten food, there usually isn’t enough energy available. Instead, the cell has come up with a roundabout way to still run gluconeogenesis (or to still run the reverse of glycolysis) without requiring large amounts of energy. Only the irreversible reactions require these roundabout ways, or detours, as the rest of the reactions are reversible and do not require large amounts of energy, regardless of
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