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Question

Choose the correct answers from the alternatives given :
The direct energy source that drives ATP synthesis during oxidative phosphorylation is

A
a difference of H+ concentration on opposite sides of the inner mitochondrial membrane
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B
the affinity of oxygen for electrons
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C
oxidation of glucose and other organic compounds
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D
endergonic flow of electrons down the electron transport chain
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Solution

The correct option is A a difference of H+ concentration on opposite sides of the inner mitochondrial membrane
  • In mitochondria the ETS is used for the transport of electrons and hydronium ions from inner mitochondrial membrane to the inter membrane matrix of mitochondria.
  • Due to this the concentration of hydronium ions increases in the intermembrane matrix.
  • The ATP synthase complex which is present in the inner membrane of the mitochrondria are used for the synthesis of ATP.
  • The complex is used to transport hydronium ions from the intermembrane matrix down its concentration gradient
  • For every 2 hydronium ions transported through the complex one molecule of ATP is generated.
  • Therefore the transport of the H+ ions due the difference in the concentration provides direct energy for the formation of ATP.
  • Therefore the correct answer is option 'a difference of H+ concentration on opposite sides of the inner mitochondrial membrane'.










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