Question

(a) One mole of glucose contains 2870 kJ of energy. The hydrolysis of one mole of ATP releases 30.7 kJ of energy. Calculate the percentage of energy that is transformed to useful energy in the body. Show your working. _____ (b) Use your calculations above to explain why shivering keeps you warm and extreme muscular exertion causes you to get hot: _____

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a)\textbf{a)}

1 mole of glucose contains 2870 kJ of energy;

Breakdown of glucose produces 38 molecules ATP;

Hydrolysis of 1 mole ATP releases 30.7 kJ of energy;

Hydrolysis of 38 moles ATP gives:

38 ×\times 30,7 = 1166.6 kJ of usefull energy

The percentage of energy transformed into useful energy, we calculate by simple proportion:

2870 : 100 = 1166.6 : x

x = 1166.6×1002870\dfrac {1166.6 \times 100}{2870}

x = 40,6 %\% of energy is transformed into useful energy.

The rest of the energy is released in the form of heat, which warms our body.

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