Assertion: $A T P$ ase 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 stroma.

If both assertion and reason are false.

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If assertion is true but the reason is false.

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If both assertion and reason are true but the reason is not the correct explanation of the assertion.

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If both assertion and reason are true and the reason is the correct explanation of the assertion.

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Solution

The correct option is A If both assertion and reason are false.
Assertion-Reason relation

The $A T P$ synthase ( $A T P$ ase) is a transmembrane enzyme that extends across the thylakoid membrane. It has two parts- $F_{0}$ and $F_{1}$ .

The $F_{0}$ provides a channel for the protons to diffuse across the membrane. This facilitated diffusion happens due to the proton gradient created across the membrane.

Assertion-Reason relation

The $F_{1}$ is the part of $A T P$ synthase that protrudes towards the stroma on the thylakoid membrane. It uses up the energy from the breakdown of proton gradient and synthesises $A T P$ .

So, both assertion and reason are incorrect.

Final answer

(D) If both assertion and reason are false.

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Similar questions

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

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 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. Assertion: Chemiosmosis requires a membrane, a proton pump, a proton gradient and

A T P

ase.

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

A T P

ase.

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.

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