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 |
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 |
The products of non-cyclic photophosphorylation include:
1. | ATP and P700 | 2. | ATP and NADPH |
3. | ADP and NADP | 4. | P700 and P680 |
The and photosynthesis pathways are so called because the initial carbon fixation product in them are respectively:
1. | pyruvate; malate |
2. | malate; pyruvate |
3. | 3-phosphoglycerate; oxaloacetic acid |
4. | glyceraldehyde 3-phosphate; phospho-enol-pyruvate (PEP) |
The extra ATP required [as compared to NADPH] in Calvin cycle comes from:
1. | photosystem II | 2. | photosystem I |
3. | cyclic electron flow | 4. | non cyclic electron flow |
In the given simplified diagram of the Calvin Cycle,
ATP is utilized at points:
1. A and B only
2. A and C only
3. B and C only
4. A, B and C
The chronological order of organelles involved in the photorespiration cycle is:
1. | chloroplasts, leaf peroxisomes and mitochondria |
2. | chloroplasts, mitochondria and leaf peroxisomes |
3. | mitochondria, chloroplasts, and leaf peroxisomes |
4. | mitochondria, leaf peroxisomes and chloroplasts |
In the diagram showing relation between Calvin cycle and Photorespiration the molecule labeled X can be:
1. Oxygen
2. Ammonia
3. Nitric oxide
4. Hydrogen sulfide
Chemiosmosis in chloroplasts is possible because of:
1. | establishment of a proton gradient across the thylakoid membrane. |
2. | diffusion of electrons through the ATP synthase. |
3. | osmosis of water from thylakoid to stroma. |
4. | presence of large amount of oxygen in the stroma. |
The ATP synthase complexes in a plant cell are located:
I: | in the thylakoid membrane |
II: | in the plasma membrane |
III: | in the inner mitochondrial membrane |
1. | I and II only | 2. | I and III only |
3. | II and III only | 4. | I, II and III |