MCQOPTIONS
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MCQOPTIONS
This section includes 14 Mcqs, each offering curated multiple-choice questions to sharpen your Biology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What is the heme portion of catalase known as? |
| A. | Coenzyme |
| B. | Prosthetic group |
| C. | Metal enzyme |
| D. | Apoenzyme |
| Answer» C. Metal enzyme | |
| 2. |
The association of which of these with apoenzymes is transient? |
| A. | Coenzyme |
| B. | Prosthetic group |
| C. | Metal enzyme |
| D. | Apoenzyme |
| Answer» B. Prosthetic group | |
| 3. |
Which of these is the cofactor for carboxypeptidase? |
| A. | Manganese |
| B. | Magnesium |
| C. | Zinc |
| D. | Copper |
| Answer» D. Copper | |
| 4. |
What type of enzyme catalyzes the conversion of d-lactic acid to l-lactic acid? |
| A. | Oxidoreductases |
| B. | Transferases |
| C. | Isomerases |
| D. | Ligases |
| Answer» D. Ligases | |
| 5. |
Which of these statements is true regarding competitive inhibitors? |
| A. | It inhibits the activity of substrate |
| B. | Malonate increases succinic dehydrogenase activity |
| C. | They are structurally different from the substrate |
| D. | They are used in the control of bacterial pathogens |
| Answer» E. | |
| 6. |
Velocity of an enzymatic reaction keeps on increasing with an increase in substrate concentration. True or false? |
| A. | True |
| B. | False |
| Answer» C. | |
| 7. |
Nicotinamide adenine dinucleotide is a _____ |
| A. | cofactor |
| B. | prosthetic group |
| C. | apoenzyme |
| D. | coenzyme |
| Answer» E. | |
| 8. |
How many classes are enzymes divided into? |
| A. | 6 |
| B. | 7 |
| C. | 5 |
| D. | 8 |
| Answer» B. 7 | |
| 9. |
Which of these substances is structurally similar to succinate? |
| A. | Pyruvate |
| B. | Acetate |
| C. | Malonate |
| D. | Oxaloacetate |
| Answer» D. Oxaloacetate | |
| 10. |
Which of these is the third step of an enzymatic reaction? |
| A. | Binding of the substrate to the enzyme |
| B. | Change in the conformation of the enzyme |
| C. | Production of an enzyme-substrate complex |
| D. | Release of product from the enzyme |
| Answer» D. Release of product from the enzyme | |
| 11. |
Which of these is the second step of an enzymatic reaction? |
| A. | Binding of the substrate to the enzyme |
| B. | Change in the conformation of the enzyme |
| C. | Production of an enzyme-substrate complex |
| D. | Release of product from the enzyme |
| Answer» B. Change in the conformation of the enzyme | |
| 12. |
Which of these conditions signify an exothermic reaction? |
| A. | The energy of the product is lesser than that of the enzyme-substrate complex |
| B. | The energy of the product is higher than that of the substrate |
| C. | The energy of the product is lesser than that of the substrate |
| D. | The energy of the product is equal to that of the substrate |
| Answer» D. The energy of the product is equal to that of the substrate | |
| 13. |
Which of these statements is false regarding transition states in enzymatic reactions? |
| A. | They are more unstable than products |
| B. | They have high energy |
| C. | They have a lower energy than both substrate and product |
| D. | An enzyme-substrate complex is formed during this period |
| Answer» D. An enzyme-substrate complex is formed during this period | |
| 14. |
The energy of the transition state of an enzymatic reaction is _____ |
| A. | higher than the energy of the product but lesser than that of the substrate |
| B. | lower than the energy of the product |
| C. | equal to the energy of the substrate |
| D. | higher than the energies of both the substrate and the product |
| Answer» E. | |