Manipal Medical Manipal Medical Solved Paper-2005

  • question_answer
    The mechanism of ATP formation both in chloroplast   and   mitochondria is explained by:

    A)  Relay pump theory of Godlewski

    B)  Cholodny-Wents model

    C)  Chemiosmotic theory

    D)  Munchs mass flow hypothesis

    Correct Answer: C

    Solution :

     As per Peter Mitchells chemiosmotic coupling hypothesis, outward pumping of protons across the inner chloroplast or mitochondrial membrane results in accumulation of protons between outer membrane and inner membrane. A proton gradient is thus established. As protons now flow back passively down the gradient, the proton motive force is utilised to synthesize ATP.


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