MCQOPTIONS
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MCQOPTIONS
This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following is false about lysozyme? |
| A. | It is an antibacterial agent found in tears and egg white |
| B. | The substrate of lysozyme is peptidoglycan |
| C. | Lysozyme cleaves (β1 → 4) glycosidic C-O bonds between two types of sugar residue in the molecule NAM and NAG |
| D. | It is a bisubstrate enzyme |
| Answer» E. | |
| 2. |
Which of the following catalyzes the reversible reaction of β-D-Glucose to glucose 6-phosphate? |
| A. | Chymotrypsin |
| B. | Hexokinase |
| C. | Enolase |
| D. | Trypsin |
| Answer» C. Enolase | |
| 3. |
Which of the following catalyzes the reversible degradation of 2-phosphoglycerate to phosphoenolpyruvate? |
| A. | Chymotrypsin |
| B. | Hexokinase |
| C. | Enolase |
| D. | Trypsin |
| Answer» D. Trypsin | |
| 4. |
The polypeptide chains in chymotrypsin are linked by ___________ |
| A. | Hydrogen bonds |
| B. | Ionic bonds |
| C. | Disulfide bond |
| D. | SH-SH bond |
| Answer» D. SH-SH bond | |
| 5. |
WHICH_OF_THE_FOLLOWING_CATALYZES_THE_REVERSIBLE_REACTION_OF_‚ÂÀ√≠‚ÄÖ√¢¬ß-D-GLUCOSE_TO_GLUCOSE_6-PHOSPHATE??$# |
| A. | Chymotrypsin |
| B. | Hexokinase |
| C. | Enolase |
| D. | Trypsin |
| Answer» C. Enolase | |
| 6. |
Which_of_the_following_is_false_about_lysozyme?$ |
| A. | It is an antibacterial agent found in tears and egg white |
| B. | The substrate of lysozyme is peptidoglycan |
| C. | Lysozyme cleaves (β1 → 4) glycosidic C-O bonds between two types of sugar residue in the molecule NAM and NAG |
| D. | It is a bisubstrate enzyme |
| Answer» E. | |
| 7. |
Which of the following catalyzes the reversible degradation of 2-phosphoglycerate to phosphoenolpyruvate? |
| A. | Chymotrypsin |
| B. | Hexokinase |
| C. | Enolase |
| D. | Trypsin |
| Answer» D. Trypsin | |
| 8. |
Which of the following is true about the structure of hexokinase? |
| A. | U-shaped |
| B. | T-shaped |
| C. | E-shaped |
| D. | G-shaped |
| Answer» B. T-shaped | |
| 9. |
Which of the following is false about chymotrypsin? |
| A. | Hydrolytic cleavage of a peptide bond by chymotrypsin has two phases |
| B. | It is activated in the presence of trypsin |
| C. | It is synthesized in the thyroid gland |
| D. | Polypeptide chains in chymotrypsin are linked by S-S bonds |
| Answer» D. Polypeptide chains in chymotrypsin are linked by S-S bonds | |
| 10. |
The polypeptide chains in chymotrypsin are linked by |
| A. | Hydrogen bonds |
| B. | Ionic bonds |
| C. | Disulfide bond |
| D. | SH-SH bond |
| Answer» D. SH-SH bond | |
| 11. |
Which of the following statements are true about the reactions at the active center of chymotrypsin? |
| A. | The aspartate residue gives an electron to histidine |
| B. | The aspartate residue gives a proton to histidine |
| C. | The aspartate residue keeps the histidine in the correct direction |
| D. | A proton moves from the aspartate to serine to histidine in the catalytic triad of chymotrypsin |
| Answer» D. A proton moves from the aspartate to serine to histidine in the catalytic triad of chymotrypsin | |
| 12. |
The active site of chymotrypsin consists of a catalytic triad of which of the following amino acid residues? |
| A. | Serine, histidine and aspartate |
| B. | Serine, histidine and glutamate |
| C. | Threonine, histidine and aspartate |
| D. | Methionine, histidine and aspartate |
| Answer» B. Serine, histidine and glutamate | |
| 13. |
By what factor chymotrypsin enhances the rate of peptide bond hydrolysis? |
| A. | 10<sup>7</sup> |
| B. | 10<sup>8</sup> |
| C. | At least 10<sup>9</sup> |
| D. | 10<sup>6</sup> |
| Answer» D. 10<sup>6</sup> | |