MCQOPTIONS
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MCQOPTIONS
This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Technology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following is not true for covalent catalysis? |
| A. | A number of coenzymes for covalent adducts generating new electrophilic groups which can function as electron sink |
| B. | These adduct forming coenzymes leads to increase in rate acceleration |
| C. | About 100 enzymes show covalent intermediates during catalysis |
| D. | Hydrolysis of acetyl imidazole is an example of this type of catalysis |
| Answer» E. | |
| 2. |
Which of the following is not involved in covalent catalysis? |
| A. | Bases which catalyze the reaction by accepting a proton |
| B. | Electron rich nucleophilic function group of amino acid side chain |
| C. | Electron deficient electrophilic portion of substrate |
| D. | Acylated, phosphorylated or glycosylated enzyme nucleophile as covalent intermediate |
| Answer» B. Electron rich nucleophilic function group of amino acid side chain | |
| 3. |
Which of the following statement is not true for catalysis by approximation? |
| A. | Change in conformation 3D structure of protein from low activity form to high activity form |
| B. | To make reactants proximal to each other |
| C. | This proximity raises effective concentration over that of the reactants free in solution and lead to rate acceleration |
| D. | To quantify some proximity effects, model studies were carried out |
| Answer» B. To make reactants proximal to each other | |
| 4. |
Which of the following is not true for strain distortion and conformational change? |
| A. | Bases increases the reaction rate by increasing the nucleophilic character of the attacking group |
| B. | The strain in the starting material and release of that strain provides rate acceleration in chemical reactions |
| C. | This experiment was carried out by Westheimer and his colleagues |
| D. | Rate of hydrolysis of phosphate esters in two compounds was explained by this theory |
| Answer» B. The strain in the starting material and release of that strain provides rate acceleration in chemical reactions | |
| 5. |
The reaction in the diagram belongs to which type of catalysis? |
| A. | Strain distortion and conformational change |
| B. | Approximation catalysis |
| C. | Acid base catalysis |
| D. | Covalent catalysis |
| Answer» D. Covalent catalysis | |
| 6. |
Which of the following is not true for acid base catalysis? |
| A. | Bases catalyze the reaction by accepting a proton |
| B. | Bases increases the reaction rate by increasing the nucleophilic character of the attacking group |
| C. | To make reactants proximal to each other |
| D. | Specific hydroxide ion catalysis of reaction in water is an example of this type of catalysis |
| Answer» D. Specific hydroxide ion catalysis of reaction in water is an example of this type of catalysis | |
| 7. |
___________ catalyze the reaction by accepting a proton. |
| A. | Acid |
| B. | Entrapment |
| C. | Enzyme |
| D. | Bases |
| Answer» E. | |