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C3 Cycle

Which part of...

Question

Which part of the ATPase enzyme forms a transmembrane channel in the thylakoid membrane which carries out facilitated diffusion of protons across the membrane?

A

Both F₀and F₁

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B

C₁

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C

F₁

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D

F₀

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Solution

The correct option is D
F₀

The ATPase enzyme consists of two parts - F₀ and F₁. F₀ is embedded in the thylakoid membrane and forms a transmembrane channel which carries out facilitated diffusion of protons across the membrane. F₁ protrudes to the outer side of the membrane to face the stroma and carries out synthesis of ATP molecules.

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Similar questions

Q. Assertion :The proton gradient results in movement of protons across the membrane to stroma through the transmembrane channel of the

F_{0}

of the ATPase. Reason: This proton gradient leads to release of energy

Q. Identify the correct statements for ATP synthase.
(i) This enzyme consists of two parts: hydrophobic membrane bound portion called F₀ & a portion that sticks out into stroma called F₁.
(ii) F₀ appears to form a channel across the membrane through which proton can pass.
(iii) The conformational change in the F₁portion of the complex synthesizes ATP.
(iv) The proton motive force that drives the synthesis of ATP is associated with this enzyme.

Q. Assertion :The proton gradient is broken down due to the movement of protons across the membrane channel of the

F_{0}

of the ATPase Reason: It is the breakdown of proton gradient that leads to release of energy.

During chemiosmotic synthesis of ATP, protons diffuse through

C F_{0}

channels that activates ATPase enzyme. As a result, one molecule of ATP is formed when ________ passes through ATPase.

Q. Select the correct option:

Study the following statements regarding chemiosmotic hypothesis in mitochondria and select the correct ones.
(i)

F_{1}

headpiece contains the site for the syntesis of ATP from ADP+Pi.
(ii)

F_{0}

part forms the channel through which protons cross the inner membrane.
(iii) For each ATP produced,

{2 H}^{+}

F_{0}

from the intermembrane space to the matrix down the electrochemical proton gradient.

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