NEET Sample Paper NEET Sample Test Paper-39

  • question_answer The chemiosmotic coupling hypothesis of oxidative phosphorylation proposes that adenosine triphosphate (ATP) is formed because:

    A)  A proton gradient forms across the inner membrane

    B)  There is a change in the permeability of the inner mitochondrial membrane toward adenosine diphosphate (ADP)

    C)  High energy bonds are formed in mitochondrial proteins

    D)  ADP is pumped out of the matrix into the intermembrane space

    Correct Answer: A

    Solution :

    Chemiosmotic theory postulated by the British biochemical Peter Mitchell (1920-1922) to explain the formation of ATP in the mitochondrial electron transport chain. As electrons are transferred along the electron carrier system in the inner mitochondrial membrane, hydrogen ions (protons) are actively transported into the space between the inner and outer mitochondrial membranes, which thus contains a higher concentration of protons than the matrix. This creates an electrochemical gradient across the inner membrane, through which protons move back into the matrix.


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