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The Chemiosmotic Hypothesis

The protons f...

Question

The protons formed by splitting of water are released into the

A

lumen of the thylakoids

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B

outer side of the membrane

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C

stroma of chloroplast

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D

both (a) and (b)

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Solution

The correct option is A lumen of the thylakoids
When a photon of light strikes the reaction centre of PS II, it emits an electron. Two $H_{2}$ $O$ molecules bind to an enzyme at reaction centre and enzyme splits the water and H+ are released in the lumen and also $O_{2}$ is produced.

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Similar questions

Q. We need to emphasis here that the water splitting complex is associated with the PS II. which itself is physically located on the inner side of the membrance of the thylakoid. Then, where are the protons and

O_{2}

formed likely to be released- in the lumen?or on the outer side of the membrane?

Q. Where are the protons and

O_{2}

formed likely to be released – in the lumen or on the outer side of the membrane?

Splitting of water molecules during light reaction of photosynthesis is associated with

(a) PS I resulting in the release of $O_{2}$ , protons and transfer of electrons to PS II

(b) PS II resulting in release of $O_{2}$ , protons and transfer of electrons to PS I

(c) PS II resulting in release of $O_{2}$ , protons and transfer of electrons to PS II

(d) PS I resulting in the release of $O_{2}$ , protons and transfer of electrons to PS I.

Of the above statements

Q. In Carbon-Nitrogen fusion cycle , protons are fused to form a helium nucleus, positrons and release some energy.The number of protons fused and the number of positrons released in this process respectively are

Q. Read the following statements with respect to chemiosmosis:
(a) Splitting of water molecules takes place on the inner side of the thylakoid membrane.
(b) NADP reductase enzyme is located on the stromal side of thylakoid membrane.
(c) Energy is used to pump protons from stroma to lumen.
(d) During photophosphorylation, the pH decrease in the lumen of thylakoid.
Which of the above statement(s) is/are correct?

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