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 following diagram shows the photosynthetic carbon cycle. A and B can respectively be:
1. Pyruvate; malate or aspartate
2. Phoshoglycerate; fumarate or aspartate
3. Phosphoenol pyruvate; malate or aspartate
4. Phosphoenol pyruvate; fumarate or aspartate
Identify the correct statement:
1. | The light reactions provide ATP and NADPH to the Calvin cycle. |
2. | The light reactions provide to the Calvin cycle. |
3. | The light reactions supply oxygen to the Calvin cycle. |
4. | Calvin cycle is in no way dependent on the light reactions. |
The primary function of the Calvin cycle is to:
1. use ATP to release carbon dioxide
2. use NADPH to release carbon dioxide
3. split water and release oxygen
4. fix inorganic carbon to simple sugars
Which of the following must occur in the biochemical pathway of Calvin cycle?
1. addition of a pair of electrons from NADPH
2. inactivation of RuBP carboxylase enzyme
3. regeneration of ATP from ADP
4. regeneration of RuBP
To establish a proton gradient across the thylakoid membrane, the protons are provided by:
1. | Glucose | 2. | Chlorophyll |
3. | Membrane proteins | 4. | Water |
The process of photosynthesis has lower efficiency if photorespiration occurs because of the reduced formation of:
1. | AcetylCoA | 2. | 3-phosphoglycerate |
3. | ATP | 4. | RuBP |
Light dependent reactions are so called because they require light:
1. | to provide electrons for the process |
2. | to split the water molecule |
3. | to impart energy to the electrons in the reaction center |
4. | to hydrolyse ATP molecules |
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 products of non-cyclic photophosphorylation include:
1. | ATP and P700 | 2. | ATP and NADPH |
3. | ADP and NADP | 4. | P700 and P680 |