MCQOPTIONS
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MCQOPTIONS
This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Microbial Genetics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Why Deinococcus radiodurans is able to survive massive exposure to radiation? |
| A. | Because it produces a thick shell which acts as a shield from the radiation |
| B. | Because it has unique DNA repair mechanisms |
| C. | Because its cellwall contains radioactive elements |
| D. | Because it has many copies of genes encoding DNA repair |
| Answer» E. | |
| 2. |
Transfer of genes between cells that are in physical contact with one another is known as transformation. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
Bacterial recombination causes transformation of the recipient cell to _______________ |
| A. | donor cell |
| B. | merozygote |
| C. | zygote |
| D. | recipient cell |
| Answer» C. zygote | |
| 4. |
The transfer of genes from one cell to another by a bacteriophage is known as __________________ |
| A. | Recombination |
| B. | Conjugation |
| C. | Transduction |
| D. | Transformation |
| Answer» D. Transformation | |
| 5. |
Genetic recombination occurs between homologous chromosomes. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
Why the bacterium Treponema pallidum is difficult to culture? |
| A. | Because it requires a great deal of water to reproduce |
| B. | Because it is unable to use carbohydrates as an energy source |
| C. | Because it lacks the genes needed for TCA cycle and oxidative phosphorylation |
| D. | Because it requires extremely low temperature at which water freezes |
| Answer» D. Because it requires extremely low temperature at which water freezes | |
| 7. |
Which of the following theory is supported by the genomic sequence of the obligate intracellular parasite Rickettsia prowazekii ? |
| A. | Parasitic bacteria have very large genomes |
| B. | Parasites have a definite genomic sequence similar to viruses |
| C. | Mitochondria have evolved from endosymbiotic bacteria |
| D. | All bacteria evolved from viruses |
| Answer» D. All bacteria evolved from viruses | |
| 8. |
In the time since E. coli and Salmonella diverged evolutionarily |
| A. | there has been little change in either genome |
| B. | E. coli has acquired many genes via horizontal transfer |
| C. | E, coli has lost approximately 50% of its genome |
| D. | none of these |
| Answer» D. none of these | |
| 9. |
What are bacteriocins? |
| A. | proteins |
| B. | toxins |
| C. | plasmid |
| D. | sex factor |
| Answer» B. toxins | |
| 10. |
The cell in which the F factor carries along with it some chromosomal genes are known as ____________ |
| A. | F+ cell |
| B. | F cell |
| C. | F cell |
| D. | F cell |
| Answer» D. F cell | |
| 11. |
The transfer of naked DNA from one cell to another is referred to as _______________ |
| A. | Transduction |
| B. | Lysogeny |
| C. | Transformation |
| D. | Conjugation |
| Answer» D. Conjugation | |
| 12. |
Which of the enzymes are used to cut the recipient DNA? |
| A. | endonuclease |
| B. | exonuclease |
| C. | ligases |
| D. | polymerase |
| Answer» B. exonuclease | |