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. |
Which of the following enzyme is used to join the DNA fragments together? |
| A. | polymerases |
| B. | exonuclease |
| C. | endonuclease |
| D. | ligase |
| Answer» E. | |
| 2. |
Photoreactivation can cause repair of DNA damaged by which of the following mutagens? |
| A. | UV rays |
| B. | X-rays |
| C. | Nitrous acid |
| D. | Base analogs |
| Answer» B. X-rays | |
| 3. |
Acridine orange is which type of mutagen? |
| A. | base analog |
| B. | chemical compounds |
| C. | intercalating agents |
| D. | transposons |
| Answer» D. transposons | |
| 4. |
Base analogs have the same hydrogen-bonding properties as the normal bases. |
| A. | True |
| B. | False |
| Answer» C. | |
| 5. |
BASE_ANALOGS_HAVE_THE_SAME_HYDROGEN-BONDING_PROPERTIES_AS_THE_NORMAL_BASES.?$ |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
Photoreactivation can cause repair of DNA damaged by which of the following mutagens? |
| A. | UV rays |
| B. | X-rays |
| C. | Nitrous acid |
| D. | Base analogs |
| Answer» B. X-rays | |
| 7. |
Acridine_orange_is_which_type_of_mutagen?$ |
| A. | base analog |
| B. | chemical compounds |
| C. | intercalating agents |
| D. | transposons |
| Answer» D. transposons | |
| 8. |
What is the mutation rate for E.coli per bacterium per cell division? |
| A. | 5.8 x 10<sup>-6</sup> |
| B. | 5.8 x 10<sup>-9</sup> |
| C. | 5.8 x 10<sup>-8</sup> |
| D. | 5.8 x 10<sup>-7</sup> |
| Answer» D. 5.8 x 10<sup>-7</sup> | |
| 9. |
Which_of_the_following_enzyme_is_used_to_join_the_DNA_fragments_together? |
| A. | polymerases |
| B. | exonuclease |
| C. | endonuclease |
| D. | ligase |
| Answer» E. | |
| 10. |
Which of the following mutagen causes a break in the phosphodiester backbone of the nucleic acid? |
| A. | UV light |
| B. | X-rays |
| C. | Nitrous acid |
| D. | base analogs |
| Answer» C. Nitrous acid | |
| 11. |
Which of the following mutations result in frameshift mutation? |
| A. | missense mutation |
| B. | transition |
| C. | transversion |
| D. | insertion |
| Answer» E. | |
| 12. |
In nonsense mutation, the new mRNA codon specifies the same amino acid as that from the original codon. |
| A. | True |
| B. | False |
| Answer» C. | |
| 13. |
Sickle cell anemia is which type of mutation? |
| A. | nonsense mutation |
| B. | missense mutation |
| C. | deletion mutation |
| D. | insertion mutation |
| Answer» C. deletion mutation | |
| 14. |
The replacement of a purine by a pyrimidine or vice versa is known as ____________ |
| A. | tranversion |
| B. | transition |
| C. | base-pair substitution |
| D. | missense mutation |
| Answer» B. transition | |
| 15. |
Populations of cells descending from a single cell are known as ____________ |
| A. | mutants |
| B. | clones |
| C. | wild-type cells |
| D. | parent cell |
| Answer» C. wild-type cells | |
| 16. |
Which is the functional unit of inheritance? |
| A. | DNA |
| B. | Chromosome |
| C. | Gene |
| D. | RNA |
| Answer» D. RNA | |
| 17. |
Bacterial chromosome has the capacity to code for ____________ different proteins. |
| A. | 900 |
| B. | 300 |
| C. | 1500 |
| D. | 3500 |
| Answer» E. | |