MCQOPTIONS
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MCQOPTIONS
This section includes 15 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. |
If the foreign DNA lacks the Chi site what will happen? |
| A. | Chi site of DNA will destroy |
| B. | Foreign DNA is not affected |
| C. | Foreign DNA easily enters the cell |
| D. | DNA sequence will be intact as previous |
| Answer» D. DNA sequence will be intact as previous | |
| 2. |
What is the sequence of the Chi site that is highly found in the E. coli genome? |
| A. | GATAATCC |
| B. | GCTGGTGGC |
| C. | CCGGACCTT |
| D. | ATGCCGCC |
| Answer» C. CCGGACCTT | |
| 3. |
The nuclease activity of the RecBCD is prone to digest the bacterial cell wall from foreign DNA. |
| A. | True |
| B. | False |
| Answer» C. | |
| 4. |
How many times the frequency is increased by the Chi sites? |
| A. | ≈10 fold |
| B. | ≈20 fold |
| C. | ≈30 fold |
| D. | ≈40 fold |
| Answer» B. ≈20 fold | |
| 5. |
What is the speed of driving the RecBCD along the DNA? |
| A. | More than 2000 bp per second |
| B. | More than 1000 bp per second |
| C. | More than 200 bp per second |
| D. | More than 100 bp per second |
| Answer» C. More than 200 bp per second | |
| 6. |
What are the two components of RecBCD pathway involved as motor parts? |
| A. | RecB, RecD |
| B. | RecB, RecC |
| C. | RecB, RecA |
| D. | RecC, RecD |
| Answer» B. RecB, RecC | |
| 7. |
What is the function of Rec component? |
| A. | 5’→3’ helicase activity |
| B. | 3’→5’ helicase activity |
| C. | Recognize Chi sites |
| D. | Nuclease activity |
| Answer» D. Nuclease activity | |
| 8. |
What are the helicase components of the RecBCD pathway? |
| A. | RecB, RecC |
| B. | RecC, RecD |
| C. | RecB, RecD |
| D. | RecA, RecB |
| Answer» D. RecA, RecB | |
| 9. |
Chi is the control site of the RecBCD pathway. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
RecBCD pathway is an ATP dependent process. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 11. |
RecBCD enzyme has polymerase and transcriptase activity. |
| A. | True |
| B. | False |
| Answer» C. | |
| 12. |
What is the holiday junction resolving enzyme? |
| A. | RecA |
| B. | RuvC |
| C. | Rad52 |
| D. | Rad59 |
| Answer» C. Rad52 | |
| 13. |
In bacteria specific proteins are involved in the RecBCD pathway. |
| A. | True |
| B. | False |
| Answer» C. | |
| 14. |
RecBCD and RecFOR in E. coli is involved in the process ____________ |
| A. | Assembly of strand exchange |
| B. | Holiday junction recognition |
| C. | Introduction of DSB |
| D. | Resolution process |
| Answer» B. Holiday junction recognition | |
| 15. |
RecA protein of E. coli is involved in the process of ____________ |
| A. | Pairing of homologous DNA |
| B. | Introduction of DSB |
| C. | Assembly of strand exchange |
| D. | Resolution of Holiday junction |
| Answer» B. Introduction of DSB | |