MCQOPTIONS
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MCQOPTIONS
This section includes 20 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 type of supercoiling takes the form of extended right-handed coils? |
| A. | Plectonemic supercoiling |
| B. | Solenoidal supercoiling |
| C. | Negative supercoiling |
| D. | Positive supercoiling |
| Answer» B. Solenoidal supercoiling | |
| 2. |
Under-winding is measured in terms of ____________ |
| A. | Supercoiling |
| B. | Linking difference |
| C. | Positive supercoiling |
| D. | Negative supercoiling |
| Answer» C. Positive supercoiling | |
| 3. |
The type I enzyme(s) is/are ____________ |
| A. | Topoisomerases I and III |
| B. | Topoisomerases II |
| C. | Topoisomerase IV |
| D. | Topoisomerases I and IV |
| Answer» B. Topoisomerases II | |
| 4. |
The type of topoisomerases that can introduce negative supercoils is ____________ |
| A. | Type I |
| B. | Type II |
| C. | Type III |
| D. | Type IV |
| Answer» C. Type III | |
| 5. |
The type of topoisomerases which generally relaxes DNA by removing negative supercoiling? |
| A. | Type I |
| B. | Type II |
| C. | Type III |
| D. | Type IV |
| Answer» B. Type II | |
| 6. |
The enzyme responsible for the removal of supercoiling in replicating DNA ahead of the replication fork is ____________ |
| A. | Topoisomerase |
| B. | Primase |
| C. | DNA polymerase |
| D. | Helicase |
| Answer» B. Primase | |
| 7. |
Changing twist from the relaxed state requires adding energy and increases the ____________ |
| A. | Forces in molecule |
| B. | Stress along molecule |
| C. | Strain over molecule |
| D. | None of the above |
| Answer» C. Strain over molecule | |
| 8. |
Over-twisting of a molecule results in ____________ |
| A. | Negative supercoiling |
| B. | Positive supercoiling |
| C. | Elongation |
| D. | Compression |
| Answer» C. Elongation | |
| 9. |
When there is no net bending of the DNA axis upon itself, the DNA is said to be in a ____________ |
| A. | Elongated state |
| B. | Compressed state |
| C. | Relaxed state |
| D. | Denatured state |
| Answer» D. Denatured state | |
| 10. |
The phenomenon of twisting around itself by a molecule to relieve helical stress is ____________ |
| A. | Supercoiling |
| B. | Coiling |
| C. | Elongation |
| D. | Compression |
| Answer» B. Coiling | |
| 11. |
UNDER-WINDING_IS_MEASURED_IN_TERMS_OF?$ |
| A. | Supercoiling |
| B. | Linking difference |
| C. | Positive supercoiling |
| D. | Negative supercoiling |
| Answer» C. Positive supercoiling | |
| 12. |
Which type of supercoiling takes the form of extended right-handed coils?$ |
| A. | Plectonemic supercoiling |
| B. | Solenoidal supercoiling |
| C. | Negative supercoiling |
| D. | Positive supercoiling |
| Answer» B. Solenoidal supercoiling | |
| 13. |
The type I enzyme(s) is/ar? |
| A. | Topoisomerases I and III |
| B. | Topoisomerases II |
| C. | Topoisomerase IV |
| D. | Topoisomerases I and IV |
| Answer» B. Topoisomerases II | |
| 14. |
The type of topoisomerases that can introduce negative supercoils is |
| A. | Type I |
| B. | Type II |
| C. | Type III |
| D. | Type IV |
| Answer» C. Type III | |
| 15. |
The type of topoisomerases which generally relaxes DNA by removing negative supercoiling is |
| A. | Type I |
| B. | Type II |
| C. | Type III |
| D. | Type IV |
| Answer» B. Type II | |
| 16. |
The enzyme responsible for the removal of supercoiling in replicating DNA ahead of the replication fork is |
| A. | Topoisomerase |
| B. | Primase |
| C. | DNA polymerase |
| D. | Helicase |
| Answer» B. Primase | |
| 17. |
Changing twist from relaxed state requires adding energy and increases the |
| A. | Forces in molecule |
| B. | Stress along molecule |
| C. | Strain over molecule |
| D. | None of the above |
| Answer» C. Strain over molecule | |
| 18. |
Over-twisting of a molecule results in |
| A. | Negative supercoiling |
| B. | Positive supercoiling |
| C. | Elongation |
| D. | Compression |
| Answer» C. Elongation | |
| 19. |
When there is no net bending of the DNA axis upon itself, the DNA is said to be in a |
| A. | Elongated state |
| B. | Compressed state |
| C. | Relaxed state |
| D. | Denatured state |
| Answer» D. Denatured state | |
| 20. |
The phenomenon of twisting around itself by a molecule to relieve helical stress is |
| A. | Supercoiling |
| B. | Coiling |
| C. | Elongation |
| D. | Compression |
| Answer» B. Coiling | |