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Assertion: The proton gradient is broken...

Assertion: The proton gradient is broken down due to the movement of protons across the membrane to stroma through the transmembrane channerl of the `F_(0)` of the ATPase.
Reason: The breakdonw of proton gradient leads to release of energy.

Text Solution

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The correct Answer is:
B
Electron transport in photosynthesis produces a proton gradient. The gradient develops inside the thylakoid lumen in chloroplasts. Proton gradient or high concentration of `H^(+)` in the lumen. The protom gradient is broken down due to movement of protons through tramembrane channes, `F_(0)` of ATPase. The break donw of the gradient provides enough energy to cause a confomational change in the `F_(1)` particle of the ATPase, which makes the enzyme synthesise several molecules of energy-packed ATP.
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Knowledge Check

  • Assertion: Chemiosmosis require a membrane, a proton pump, a proton gradient and ATPase. Reason: The proton gradient is broken down due to movement of proton across the membrane to the lumen through the transmembrane channel of the F_(0) of the ATPase.

    A
    If both assertion and reason are true and the reason is the correct explanation of the assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of the assertion.
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.

  • Breaddonw of proton gradient developed during chemiosmosis leads to the release of

    A
    oxygen
    B
    water
    C
    energy
    D
    protons.

  • Assertion :- The passage of protons through complex-V is coupled to production of ATP, Reason:- Passage of protons through complex V is associated with breakdown of proton gradient which leads to release of energy for joining of ADP and Pi.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.

    • Similar Questions

    Explore conceptually related problems

    Electron energy is used to drive protons against concentration gradient across thylakoid membrane into

    Electron energy is used to drive protons against concentration gradient across thylakoid membrance into

    Read the following statements (1) F0 part of ATPase is associated with breakdown of proton gradient. (2) a H-carrier contributes in creation of proton gradient. (3) movement of electrons in ETS is coupled to pumping of protons into the lumen. (4) formation of NADPH+H+ is related with the creation of proton gradient. How many of the above statements are correct?

    Assertion :- Energy is not required to pump protons from stroma to lumen. Reason :- Movement of protons from stroma to lumen is carried out through facilitated diffusion

    Assertion: ATPase enzyme has two parts, One called the F_(1) is embedded in the membrane of thylakoid and forms a transmembrane channel that carries out facilitated diffusion of proton across the membrane. Reason: The other portion is called F_(0) and protrudes on the thylakoid membrane on the side that faces the stroma

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