Write the combustion reaction of glucose and the overall reaction for the metabo

Question

Write the combustion reaction of glucose and the overall reaction for the metabolism of glucose in aerobic cells. 4. 1) What condlusion do yuraw by comparing the wo raction qutions (2) If the G°, for ATP synthesis is 30.5 kJ/mole under standard conditions, what is the G for ATP synthesis in aerobic cells where [ATP]-8 x 10.3 M, [ADP]-6 x 10-4 M and [P] = 8 x 10-3 M, at 25 °C and pH= 7? ADP + PATP H20 aerobic cells? How much energy is used by the synthesis of these ATP molecules in (3) How many moles of ATP are synthesized by the oxidation of one mole of glucose in aerobic cells? Where does the energy come from? (4) Assume the AGc for the combustion reaction of glucose is close to AGc(galactose), estimate the efficiency of energy conservation of glucose in aerobic cells.

Explanation / Answer

Glucose Combustion-

C6H12O6 + 6O2 - - - > 6CO2 + 6H2O + Energy (Heat)

Glucose metabolism-

C6H12O6 +6O2 - - - > 6CO2+ 6H2O + Energy (ATP) +Energy (Heat)  

1) Conclusion: As can be observed from the equations written above, the overall chemical reaction for Glucose combustion and metabolism in aerobic system is almost the same, both are oxidation reactions. The only difference lies in the form of the energy released. During combustion, all the energy is released in the form of thermal heat (fatal form of energy) , while during metabolism along with some thermal energy, 36 ATP molecules are produced which are equivalent to 2870Kilojoules of storable form of chemical energy. Glucose combustion is an uncontrolled one-step process while glucose metabolism is a highly controlled sequence of 12 enzymatic reactions, producing energy that can be utilized for other metabolic processes.

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