MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 17 Mcqs, each offering curated multiple-choice questions to sharpen your Microbiology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The components found in all prokaryotic transcription terminators is |
| A. | a poly-U region |
| B. | Rho factor |
| C. | a hairpin structure |
| D. | none of these |
| Answer» D. none of these | |
| 2. |
A specific __________ factor helps RNA polymerase bind to late promoters and transcribe late genes. |
| A. | sigma |
| B. | beta |
| C. | delta |
| D. | gamma |
| Answer» B. beta | |
| 3. |
Which of the following enzyme(s) is/are required for lactose fermentation? |
| A. | Transacetylase |
| B. | -galactosidase |
| C. | Galactoside permease |
| D. | All of these |
| Answer» E. | |
| 4. |
Which of these catalyzes the synthesis of RNA from a DNA template? |
| A. | DNA gyrase |
| B. | DNA ligase |
| C. | DNA polymerase |
| D. | RNA polymerase |
| Answer» E. | |
| 5. |
The location of first hexameric sequence typically found in pro-karyotic promoters is |
| A. | at the transcription start site |
| B. | approximately 35 bases upstream of the transcription start site |
| C. | approximately 10 bases upstream of the transcription start site |
| D. | approximately 25 bases upstream of the transcription start site |
| Answer» C. approximately 10 bases upstream of the transcription start site | |
| 6. |
The sigma factor |
| A. | is responsible for recognizing the termination sequence |
| B. | provides the catalytic function of cleaving off pyrophosphates during mRNA synthesis |
| C. | recognizes the promotor |
| D. | accomplishes DNA restriction |
| Answer» D. accomplishes DNA restriction | |
| 7. |
The synthesis of mRNA based on a DNA template is called |
| A. | DNA replication |
| B. | transcription |
| C. | translation |
| D. | DNA restriction |
| Answer» C. translation | |
| 8. |
An mRNA transcript of a gene contains |
| A. | a start codon |
| B. | a stop codon |
| C. | a terminator |
| D. | all of these |
| Answer» E. | |
| 9. |
Recognition/binding site of RNA polymerase is called |
| A. | receptor |
| B. | promoter |
| C. | facilitator |
| D. | terminator |
| Answer» C. facilitator | |
| 10. |
Which of the following proteins first binds to TATA box during transcription? |
| A. | TF II A |
| B. | TF II D |
| C. | TF II B |
| D. | RNA polymerase |
| Answer» C. TF II B | |
| 11. |
Which of the following enzyme is used for synthesis of RNA under the direction of DNA? |
| A. | RNA polymerase |
| B. | DNA ligase |
| C. | DNA polymerase |
| D. | RNA ligase |
| Answer» B. DNA ligase | |
| 12. |
What is the usual sequence of a Pribnow box? |
| A. | AUAUA |
| B. | TATAAT |
| C. | UUUUU |
| D. | TTGACA |
| Answer» C. UUUUU | |
| 13. |
Which of the following component of RNA polymerase facilitates the recognition of promoter sequences? |
| A. | a subunit |
| B. | b subunit |
| C. | s subunit |
| D. | c subunit |
| Answer» D. c subunit | |
| 14. |
Which of the following statement defines a replicon? |
| A. | A DNA molecule that encodes pili for conjugation |
| B. | A DNA molecule that is able to replicate and be maintained |
| C. | A DNA template which is used in transcription |
| D. | The enzyme responsible for transposition |
| Answer» C. A DNA template which is used in transcription | |
| 15. |
Which eukaryotic RNA polymerase makes tRNA's? |
| A. | RNA polymerase 1 |
| B. | RNA polymerase 2 |
| C. | RNA polymerase 3 |
| D. | Any of these |
| Answer» D. Any of these | |
| 16. |
Which of the following is a product of transcription? |
| A. | mRNA |
| B. | tRNA |
| C. | rRNA |
| D. | all of these |
| Answer» E. | |
| 17. |
A level of regulation, demonstrated by the termination of transcription if tryptophan is abundant, by the tryptophan operon in E.coli cells is called |
| A. | activation |
| B. | attenuation |
| C. | corepression |
| D. | desiccation |
| Answer» C. corepression | |