MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Biology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Why is the productivity of C4 plants better than that of C3 plants? |
| A. | C<sub>4</sub> plants show Kranz anatomy |
| B. | C<sub>4</sub> plants lack photorespiration |
| C. | C<sub>4</sub> plants show high phosphoglycerate formation |
| D. | C<sub>4</sub> plants show high phosphoglycolate formation |
| Answer» C. C<sub>4</sub> plants show high phosphoglycerate formation | |
| 2. |
Which of these is a 2-carbon molecule? |
| A. | Phosphoglycolate |
| B. | OAA |
| C. | PGA |
| D. | Malic acid |
| Answer» B. OAA | |
| 3. |
Which of these are synthesized during photorespiration? |
| A. | NADPH |
| B. | ATP |
| C. | CO<sub>2</sub> |
| D. | Sugars |
| Answer» D. Sugars | |
| 4. |
Which of these is not true regarding photorespiration? |
| A. | ATP is not synthesized |
| B. | 1 molecule of phosphoglycerate is formed |
| C. | 1 molecule of PGA is formed |
| D. | The active site of RuBisCO binds to oxygen |
| Answer» D. The active site of RuBisCO binds to oxygen | |
| 5. |
What is formed when the active site of RuBisCO binds to oxygen? |
| A. | ATP |
| B. | OAA |
| C. | PGA |
| D. | Phosphoglycolate |
| Answer» E. | |
| 6. |
When CO2: O2 is approximately 1, RuBisCO has a lower affinity for CO2. True or false? |
| A. | True |
| B. | False |
| Answer» C. | |
| 7. |
Why is carbon dioxide fixation decreased in some C3 plants? |
| A. | Phosphoglycerate formation |
| B. | Unavailability of RuBP |
| C. | Oxygen binds to RuBisCO |
| D. | Oxygen binds to RuBP |
| Answer» D. Oxygen binds to RuBP | |
| 8. |
What factor determines the binding of carbon dioxide to the active site of RuBisCO? |
| A. | Intensity of sunlight |
| B. | Number of chloroplasts |
| C. | Opening and closing of stomata |
| D. | Relative O<sub>2</sub> and CO<sub>2</sub> concentration |
| Answer» E. | |
| 9. |
What does the name RuBisCO imply? |
| A. | Its active site can bind to oxygen and carbon dioxide |
| B. | It leads to the combination of oxygen and carbon dioxide |
| C. | It uses carbon and oxygen to breakdown sugar |
| D. | It uses carbon and oxygen to breakdown RuBP |
| Answer» B. It leads to the combination of oxygen and carbon dioxide | |
| 10. |
What is the most abundant enzyme in the world? |
| A. | Papain |
| B. | Alpha amylase |
| C. | RuBisCO |
| D. | Horse radish peroxidase |
| Answer» D. Horse radish peroxidase | |
| 11. |
Complete the reaction. RuBP + CO2 |
| A. | 3 3PGA |
| B. | 2 3PGA |
| C. | 2 3PGA + RuBisCO |
| D. | 3 3PGA + RuBisCO |
| Answer» C. 2 3PGA + RuBisCO | |
| 12. |
Which of these is true regarding carbon dioxide fixation? |
| A. | RuBP and CO<sub>2</sub> give PGA |
| B. | RuBisCO combines with CO<sub>2</sub> |
| C. | 3 molecules of 2PGA are formed |
| D. | RuBP acts as a catalyst |
| Answer» B. RuBisCO combines with CO<sub>2</sub> | |
| 13. |
Which of these take place in the first step of the Calvin pathway? |
| A. | 3 molecules of 2PGA are formed |
| B. | RuBisCO combines with CO<sub>2</sub> |
| C. | RuBP and CO<sub>2</sub> give PGA |
| D. | RuBP acts as a catalyst |
| Answer» D. RuBP acts as a catalyst | |
| 14. |
What is the first step of the Calvin pathway? |
| A. | Regeneration |
| B. | Reduction |
| C. | CO<sub>2</sub> fixation |
| D. | Synthesis of sugar |
| Answer» D. Synthesis of sugar | |
| 15. |
Which of these cannot help us differentiate between C3 and C4 plants? |
| A. | Carbon dioxide acceptor molecule |
| B. | Presence of Kranz anatomy |
| C. | Photorespiration |
| D. | Number of chloroplasts |
| Answer» E. | |