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Q. No.Where are the carriers of the electrons located in a chloroplast?
| 1. | within thylakoid membranes |
| 2. | in the intra thylakoid space |
| 3. | within the inner membrane |
| 4. | in the intermembrane space [between outer and inner membrane] |
Subtopic: Â Chemiosmotic hypothesis |
 56%
Level 3: 35%-60%
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An increased leakiness of the thylakoid membrane will directly effect:
| 1. | the photolysis of water |
| 2. | synthesis of ATP |
| 3. | electron flow from PSII to PSI |
| 4. | The reduction of NADP+ |
Subtopic: Â Chemiosmotic hypothesis |
 60%
Level 2: 60%+
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The catalytic knobs of ATP synthetase in a thylakoid membrane is located:
| 1. | on the side facing the thylakoid space. |
| 2. | on the stroma side of the membrane. |
| 3. | embedded deep within the membrane |
| 4. | on the pigments molecules of Photosystems |
Subtopic: Â Chemiosmotic hypothesis |
 76%
Level 2: 60%+
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Which one of the following is not true regarding the release of energy during ATP synthesis through chemiosmosis?
It involves:
It involves:
| 1. | Reduction of NADP to NADPH2 on the stroma side of the membrane |
| 2. | Breakdown of proton gradient |
| 3. | Breakdown of electron gradient |
| 4. | Movement of protons across the membrane to the stroma |
Subtopic: Â Chemiosmotic hypothesis |
 74%
Level 2: 60%+
NEET - 2022
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| Assertion(A): | Protons produced by photolysis of water accumulate in the lumen of thylakoids. |
| Reason(R): | Photolysis of water takes place towards lumen side of thylakoid. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false statements. |
Subtopic: Â Chemiosmotic hypothesis |
 81%
Level 1: 80%+
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A protein that spans the phospholipid bilayer one or more times is
1. a transmembrane protein.
2. an integral protein.
3. a peripheral protein.
4. an integrin.
1. a transmembrane protein.
2. an integral protein.
3. a peripheral protein.
4. an integrin.
Subtopic: Â Chemiosmotic hypothesis |
 61%
Level 2: 60%+
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Regarding the thylakoid membrane:
| I: | Plastoquinone is located within the membrane |
| II: | Plastocyanin is located on the inner lumen side of the membrane |
| III: | NADP reductase is located on the stroma side of the membrane |
| 1. | Only I and II are correct |
| 2. | Only I and III are correct |
| 3. | Only II and III are correct |
| 4. | I, II and III are correct |
Subtopic: Â Chemiosmotic hypothesis |
 64%
Level 2: 60%+
Hints
Consider the given two statements:
| Statement I: | CF1 particle of ATP synthase makes ATP molecules. |
| Statement II: | CF1 particle of ATP synthase is embedded in the thylakoid membrane and forms a transmembrane channel that carries out facilitated diffusion of protons across the membrane. |
| 1. | Both Statement I and Statement II are correct |
| 2. | Both Statement I and Statement II are incorrect |
| 3. | Statement I is correct but Statement II is incorrect |
| 4. | Statement I is incorrect but Statement II is correct |
Subtopic: Â Chemiosmotic hypothesis |
 70%
Level 2: 60%+
Hints
Identify the correct statements regarding chemiosmotic hypothesis:
Choose the correct answer from the options given below:
1. (a), (b) and (e)
2. (a), (b) and (d)
3. (b), (c) and (d)
4. (b), (c) and (e)
| (a) | Splitting of the water molecule takes place on the inner side of the membrane. |
| (b) | Protons accumulate within the lumen of the thylakoids. |
| (c) | The primary acceptor of electrons transfers the electrons to an electron carrier. |
| (d) | NADP reductase enzyme is located on the stroma side of the membrane. |
| (e) | Protons increase in number in stroma. |
1. (a), (b) and (e)
2. (a), (b) and (d)
3. (b), (c) and (d)
4. (b), (c) and (e)
Subtopic: Â Chemiosmotic hypothesis |
 77%
Level 2: 60%+
NEET - 2022
Hints
Regarding ATP synthase involved in chemiosmosis in chloroplasts:
| I: | The component CF0 is embedded in the thylakoid membrane. |
| II: | The component CF1 protrudes on the outer surface of the thylakoid membrane on the side that faces the stroma. |
| 1. | Only I is correct |
| 2. | Only II is correct |
| 3. | Both I and II are correct |
| 4. | Both I and II are incorrect |
Subtopic: Â Chemiosmotic hypothesis |
 91%
Level 1: 80%+
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