Q. No.The number of electrons that need to be transported during cyclic photophosphorylation in sulphur bacteria, to produce one molecule of ATP is:
1. one
2. two
3. three
4. four
1. one
2. two
3. three
4. four
The antenna pigment molecules:
1. are responsible for photolysis of water to release oxygen
2. harvest photons and transfer light energy to the reaction-center chlorophyll
3. transfer electrons to chlorophyll a
4. transfer electrons to ferredoxin and then NADPH
The number of turns of Calvin cycle required to produce one molecule of Glyceraldehyde 3 Phosphate is:
| 1. | 1 | 2. | 2 |
| 3. | 3 | 4. | 6 |
The light independent reactions are seen in:
I. carbon fixation
II. carbon fixation
III. Crassulacean acid metabolism
| 1. I and II only | 2. I and III only |
| 3. II and III only | 4. I, II and III |
In the light dependent reactions of photosynthesis:
1. NADPH is reduced to by the enzyme NADP reductase.
2. initial carbon fixation takes place forming a 3 carbon compound.
3. ATP is not produced.
4. light is absorbed and energy is transported to reaction-center chlorophyll a
The number of molecules of NADPH and ATP required respectively to reduce six molecules of carbon dioxide to glucose in Calvin cycle?
| 1. | 6 and 6 | 2. | 12 and 12 |
| 3. | 12 and 18 | 4. | 18 and 12 |
Identify the correct statement regarding the functioning of photosystem II?
| 1. | The reaction center is P700. |
| 2. | It works after PS I in non cyclic photophosphorylation. |
| 3. | Water splits and carbon dioxide is released. |
| 4. | The electron vacancies in P680 are filled by electrons derived from water. |
Consider the following two statements regarding RuBisCO:
| I: | When carbon dioxide is the substrate, the product of the carboxylase reaction is finally two molecules of glycerate-3-phosphate. |
| II: | When molecular oxygen is the substrate, the products of the oxygenase reaction are two molecules of phosphoglycolate. |
| 1. | Only I is correct | 2. | Only II is correct |
| 3. | Both I and II are correct | 4. | Both I and II are incorrect |
Photosystem I is directly associated with:
1. passing electrons to plastoquinone
2. receiving electrons from plastocyanin
3. P680 as the chlorophyll a reaction-center
4. removal of electrons and protons from water
Identify the correct statements regarding RuBisCO:
| I: | It catalyzes the carboxylation of \(CO_2\) to ribulose 1,5-bisphosphate. |
| II: | It initiates photorespiration when the \(CO_2/O_2\) ratio is low. |
| III: | It catalyzes the reduction of two molecules of PGAL to form glucose. |
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II and III |
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