MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What is the general mechanism of an enzyme? |
| A. | It acts by reducing the activation energy |
| B. | It acts by increasing the activation energy |
| C. | It acts by decreasing the pH |
| D. | It acts by increasing the pH |
| Answer» B. It acts by increasing the activation energy | |
| 2. |
The catalytic efficiency of two distinct enzymes can be compared based on which of the following factor? |
| A. | K<sub>m</sub> |
| B. | Product formation |
| C. | Size of the enzymes |
| D. | pH of optimum value |
| Answer» B. Product formation | |
| 3. |
Where does inhibitor binds on enzyme in mixed inhibition? |
| A. | At active site |
| B. | Allosteric site |
| C. | Does not bind on enzyme |
| D. | Binds on substrate |
| Answer» C. Does not bind on enzyme | |
| 4. |
Which of the following is an example of reversible inhibitor? |
| A. | DIPF |
| B. | Penicillin |
| C. | Iodoacetamide |
| D. | Protease inhibitors |
| Answer» E. | |
| 5. |
The molecule which acts directly on an enzyme to lower its catalytic rate is __________ |
| A. | Repressor |
| B. | Inhibitor |
| C. | Modulator |
| D. | Regulator |
| Answer» C. Modulator | |
| 6. |
The rate determining step of Michaelis-Menten kinetics is __________ |
| A. | The complex dissociation step to produce products |
| B. | The complex formation step |
| C. | The product formation step |
| D. | None of the mentioned |
| Answer» B. The complex formation step | |
| 7. |
Which of the following statements is true about uncompetitive inhibitors? |
| A. | They bind covalently at a site distinct from the substrate active site |
| B. | In the presence of a uncompetitive inhibitor, the Michaelis-Menten equation becomes |
| C. | n (V_0 = frac{V_{max} [S]}{K_m+ [S]} ) |
| D. | They increase the measured V<sub>max u2061</sub> |
| E. | Apparent K<sub>m</sub> also increases |
| Answer» C. n (V_0 = frac{V_{max} [S]}{K_m+ [S]} ) | |
| 8. |
Which of the following statements is true about competitive inhibitors? |
| A. | It is a common type of irreversible inhibition |
| B. | In the presence of a competitive inhibitor, the Michaelis-Menten equation becomes |
| C. | n (V_0 = frac{V_{max} [S]}{ K_m+[S]} ) |
| D. | The apparent K<sub>m</sub> decreases in the presence of inhibitor by a factor |
| E. | The maximum velocity for the reaction decreases in the presence of a competitive inhibitor |
| Answer» C. n (V_0 = frac{V_{max} [S]}{ K_m+[S]} ) | |
| 9. |
Which of the following is the correct Line weaver-Burk equation? |
| A. | ( frac{1}{V_0} = frac{K_m}{V_{max} [S]} + frac{1}{V_{max}} ) |
| B. | ( frac{1}{V_{max}} = frac{K_m}{V_0 [S]} + frac{1}{V_0} ) |
| C. | (V_0 = frac{V_{max} [S]}{K_m+[S]} ) |
| D. | (V_{max} = frac{V_0 u2061 [S]}{K_m+[S]} ) |
| Answer» B. ( frac{1}{V_{max}} = frac{K_m}{V_0 [S]} + frac{1}{V_0} ) | |