Please show your work: Calorie charts say that a teaspoon of sugar contains abou

Question

Please show your work:

Calorie charts say that a teaspoon of sugar contains about 16 Calories (a Calorie is the same as a kilocalorie (kcal) = 4.186 kJ). Let's see if this is reasonable. Metabolism of one mole of glucose gives 32 moles of ATP assuming that the malate-aspartate shuttle is operating. Let's assume that sucrose is hydrolyzed to glucose plus fructose, and that both sugars are converted to their -6-phosphate derivatives by hexokinase. So one mole of sucrose gives 64 moles of ATP. Note that this is 64 12 = 5.3 ATP's per carbon atom. Since the molecular weight of sucrose is 342 g mole. each gram of sucrose produces 64/342 = 0. 19 mole ATP. A teaspoon of sucrose has a mass of 7.8 grams. Lookup AG for hydrolysis of ATP under steady state conditions in a "typical" cell. Calculate the number of kJ of chemical energy stored as ATP obtained from the complete aerobic metabolism of one teaspoon of table sugar. Convert your answer to Calories. Compare your result to the value found in Calorie charts.

Explanation / Answer

number of kJ of chemicL ENERGY STORED AS ATP =7.8*0.19mole=1.482mol

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