MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 18 Mcqs, each offering curated multiple-choice questions to sharpen your Microbiology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
How much time is required to inject a copy of the whole Hfr E.coli genome? |
| A. | 24 hrs |
| B. | 30 mins |
| C. | 100 mins |
| D. | 48 hrs |
| Answer» D. 48 hrs | |
| 2. |
The Hfr chromosome is transferred to the F— cell in a _____________ fashion. |
| A. | circular |
| B. | coiled |
| C. | dimer |
| D. | linear |
| Answer» E. | |
| 3. |
Which of the following can be used as a measure to construct a linkage map of the Hfr chromosome? |
| A. | frequency of recombination |
| B. | time of entry |
| C. | locus of mutation |
| D. | transfer of F factor |
| Answer» C. locus of mutation | |
| 4. |
Which of the following is true for an Hfr X F— cross? |
| A. | frequency of recombination high, transfer of F factor low |
| B. | frequency of recombination high, transfer of F factor high |
| C. | frequency of recombination low, transfer of F factor high |
| D. | frequency of recombination low, transfer of F factor low |
| Answer» B. frequency of recombination high, transfer of F factor high | |
| 5. |
What is the frequency of formation of recombinants in a F+ X F— cross? |
| A. | 100 |
| B. | 40 |
| C. | 10 |
| D. | 1 |
| Answer» E. | |
| 6. |
Which of the following cells of E.coli are referred to as F— |
| A. | Male cells |
| B. | Female cells |
| C. | Both male and female cells |
| D. | Neither male nor female cells |
| Answer» C. Both male and female cells | |
| 7. |
WHICH_OF_THE_FOLLOWING_IS_TRUE_FOR_AN_HFR_X_F‚ÄÖ√Ñ√∂‚ÀÖ√Ë‚ÀÖ√Ü_CROSS??$# |
| A. | frequency of recombination high,transfer of F factor low |
| B. | frequency of recombination high,transfer of F factor high |
| C. | frequency of recombination low,transfer of F factor high |
| D. | frequency of recombination low,transfer of F factor low |
| Answer» B. frequency of recombination high,transfer of F factor high | |
| 8. |
The Hfr chromosome is transferred to the F— cell in a _____________ fashion.$# |
| A. | circular |
| B. | coiled |
| C. | dimer |
| D. | linear |
| Answer» E. | |
| 9. |
Which_of_the_following_can_be_used_as_a_measure_to_construct_a_linkage_map_of_the_Hfr_chromosome?$ |
| A. | frequency of recombination |
| B. | time of entry |
| C. | locus of mutation |
| D. | transfer of F factor |
| Answer» C. locus of mutation | |
| 10. |
How_much_time_is_required_to_inject_a_copy_of_the_whole_Hfr_E.coli_genome? |
| A. | 24 hrs |
| B. | 30 mins |
| C. | 100 mins |
| D. | 48 hrs |
| Answer» D. 48 hrs | |
| 11. |
The F factor DNA is sufficient to specify how many genes? |
| A. | 2 |
| B. | 10 |
| C. | 40 |
| D. | 100 |
| Answer» D. 100 | |
| 12. |
What is the frequency of formation of recombinants in a F+ X F— cross?$ |
| A. | 100 |
| B. | 40 |
| C. | 10 |
| D. | 1 |
| Answer» E. | |
| 13. |
Which of the following cells of E.coli are referred to as F—?$ |
| A. | Male cells |
| B. | Female cells |
| C. | Both male and female cells |
| D. | Neither male nor female cells |
| Answer» C. Both male and female cells | |
| 14. |
What is the shape of DNA in the male cells of E.coli? |
| A. | linear |
| B. | supercoiled |
| C. | circular |
| D. | relaxed |
| Answer» D. relaxed | |
| 15. |
In conjugation only small fragments of the bacterial chromosome are transferred. |
| A. | True |
| B. | False |
| Answer» C. | |
| 16. |
Which type of E.coli strain was chosen to prove the experiment of conjugation? |
| A. | prototrophs |
| B. | auxotrophs |
| C. | polyauxotrophs |
| D. | autotrophs |
| Answer» D. autotrophs | |
| 17. |
Mating between species is necessary for recombination to take place. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 18. |
The first demonstration of recombination in bacteria was achieved by _______________ |
| A. | Lederberg and Tatum |
| B. | Luria and Delbruck |
| C. | Joshua and Lederberg |
| D. | Luria and Tatum |
| Answer» B. Luria and Delbruck | |