MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Molecular Biology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Hybrid dysgenesis is caused by which of the following transposable element? |
| A. | Non-composite transposon |
| B. | LINE |
| C. | P-element |
| D. | Ac-element |
| Answer» D. Ac-element | |
| 2. |
Which of the following about the P-element is false? |
| A. | 25 bp inverted repeats |
| B. | 2907 bp long element |
| C. | Encodes for transposase |
| D. | DNA transposon |
| Answer» B. 2907 bp long element | |
| 3. |
Which of the following is a non-composite transposon? |
| A. | Tn5 |
| B. | Tn10 |
| C. | Tn3 |
| D. | Tn9 |
| Answer» D. Tn9 | |
| 4. |
The central block of the composite transposable element consists a gene for __________ |
| A. | Transposase |
| B. | Antibiotic resistance |
| C. | Integrase |
| D. | Lactamase |
| Answer» C. Integrase | |
| 5. |
Which of the following functions is not performed by transposase? |
| A. | Restriction of the IS element |
| B. | Integration of the transposon |
| C. | Formation of the RNA intermediate |
| D. | Restriction of the host genome |
| Answer» D. Restriction of the host genome | |
| 6. |
Transposase restriction mechanism of the IS element restricts the transposon and the target DNA in a combination of which of the following? |
| A. | Blunt end cut for transposon and sticky end cut for target DNA |
| B. | Blunt end cut for both transposon and target DNA |
| C. | Sticky end cut for transposon and blunt end cut for target DNA |
| D. | Sticky end cut for both transposon and target DNA |
| Answer» B. Blunt end cut for both transposon and target DNA | |
| 7. |
The enzyme that catalyzes the transposition of an IS element is called __________ |
| A. | Transposase |
| B. | Integrase |
| C. | Transcriptase |
| D. | Polymerase |
| Answer» B. Integrase | |
| 8. |
The direct repeat within the IS element has a length of __________ |
| A. | 20 bp |
| B. | 11-15 bp |
| C. | 5-11 bp |
| D. | 3-7 bp |
| Answer» D. 3-7 bp | |
| 9. |
Direct repeats in the IS element are present __________ |
| A. | Within the transposon |
| B. | Upstream the inverted repeat |
| C. | Within the inverted repeat |
| D. | Downstream the inverted repeat |
| Answer» D. Downstream the inverted repeat | |
| 10. |
The IS elements can be identified by the presence of __________ |
| A. | Antibiotic resistance gene |
| B. | Endonuclease cleavage site |
| C. | 50 bp inverted repeat |
| D. | Integrase site |
| Answer» D. Integrase site | |
| 11. |
The transposable elements of bacteria are generally retrotransposons. |
| A. | True |
| B. | False |
| Answer» C. | |