Biophysics help please ================ Every cell in the body has organelles ca
ID: 1525138 • Letter: B
Question
Biophysics help please
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Every cell in the body has organelles called mitochondria that can generate a voltage difference between their interior and exterior If the capacitance of a mitochondrion is 2.4 times 10^-11 F and the potential difference between the interior and exterior is 0.18 V, how much electrical energy does it store? Express your answer to two significant figures and include appropriate units If a mitochondrion were to use all of its stored electrical energy to produce ATP molecules, and each ATP molecule requires 9.5 times 10^-20 J, how many molecules could it produce? (In reality, ATP molecules are produced by the flow of protons caused by the proton motive force, and not by the direct conversion of electrical energy stored by the capacitance of mitochondria) Express your answer to two significant figures.Explanation / Answer
electrical energy stored U = (1/2)*C*V^2 = (1/2)*2.4*10^-11*0.18^2 = 3.888*10^-13 J
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part B
energy of each molecule E = 9.5*10^-20 J
total energy of molecules U = n*E
nmber of molecules n = U/E = 3.888*10^-13/(9.5*10^-20) = 4.1*10^6
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