MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of following bacteria require extreme salty conditions to survive? |
| A. | Halobacterium |
| B. | Sulfolobus |
| C. | Borrelia burgdorferi |
| D. | Leptospira |
| Answer» B. Sulfolobus | |
| 2. |
Sulfolobus is an example of which of following? |
| A. | chemoautotroph |
| B. | phototrophs |
| C. | heterotrophs |
| D. | halophiles |
| Answer» B. phototrophs | |
| 3. |
F factor of E Coli consists of how many genes? |
| A. | 10 |
| B. | 30 |
| C. | 25 |
| D. | 90 |
| Answer» D. 90 | |
| 4. |
Cells containing F plasmid act as which of following during conjugation? |
| A. | donor |
| B. | receiver |
| C. | caller |
| D. | taker |
| Answer» B. receiver | |
| 5. |
From which of following autotroph organisms obtain energy? |
| A. | oxygen |
| B. | sulphur |
| C. | CO₂ |
| D. | hydrogen |
| Answer» D. hydrogen | |
| 6. |
In process of nitrogen fixation, nitrogen is converted in to which of following? |
| A. | ammonia |
| B. | methane |
| C. | nitric acid |
| D. | nitrous oxide |
| Answer» B. methane | |
| 7. |
Parasites that cause disease are called |
| A. | hosts |
| B. | symbiont |
| C. | pathogens |
| D. | bacteria |
| Answer» D. bacteria | |
| 8. |
Rubrivivax bacteria belong to which of following subgroups of proteobacteria? |
| A. | alpha |
| B. | beta |
| C. | gamma |
| D. | epsilon |
| Answer» C. gamma | |
| 9. |
Which of following bacteria are only bacteria known to lack cell walls? |
| A. | Borrelia burgdorferi |
| B. | Leptospira |
| C. | oscillatoria |
| D. | mycoplasmas |
| Answer» E. | |
| 10. |
A handful of soil can contain an estimate of about how many prokaryotic species? |
| A. | 10000 |
| B. | 100 |
| C. | 1000 |
| D. | 200 |
| Answer» B. 100 | |
| 11. |
From which of following heterotroph organisms obtain energy? |
| A. | sulphur |
| B. | chemicals |
| C. | organic nutrient |
| D. | co2 |
| Answer» D. co2 | |
| 12. |
Resistant form of bacteria that is dormant is called |
| A. | endospores |
| B. | spores |
| C. | eggs |
| D. | mutant |
| Answer» B. spores | |
| 13. |
Which of following bacteria attacks other bacteria by attaching to their surface molecules? |
| A. | vibrio cholerae |
| B. | salmonella |
| C. | Bdellovibrios |
| D. | Thiomargarita namibiensis |
| Answer» D. Thiomargarita namibiensis | |
| 14. |
Neisseria gonorrhoeae causes which of following? |
| A. | gonorrhea |
| B. | anthrax |
| C. | polio |
| D. | measles |
| Answer» B. anthrax | |
| 15. |
A Halobacterium cell compensates for water loss by pumping which ions in cell? |
| A. | K |
| B. | O₂ |
| C. | H₂ |
| D. | |
| Answer» B. O₂ | |
| 16. |
Which of following is reproduced by E Coli? |
| A. | binary fission |
| B. | separation |
| C. | duplication |
| D. | reproduction |
| Answer» B. separation | |
| 17. |
Which of following is caused by Shigella bacterium? |
| A. | dysentery |
| B. | cholera |
| C. | measles |
| D. | shingles |
| Answer» B. cholera | |
| 18. |
Chemotaxis is movement of a cell-based on which stimulus? |
| A. | chemical |
| B. | water |
| C. | smell |
| D. | gravity |
| Answer» B. water | |
| 19. |
Which of following bacteria are responsible for food poisoning? |
| A. | vibrio cholerae |
| B. | salmonella |
| C. | neisseria gonorrhoeae. |
| D. | Thiomargarita namibiensis |
| Answer» C. neisseria gonorrhoeae. | |
| 20. |
Chloroplasts have been hypothesized to be driven from which of following bacteria? |
| A. | spirochetes |
| B. | cyanobacteria |
| C. | treponema pallidum |
| D. | salmonella |
| Answer» C. treponema pallidum | |
| 21. |
From which of following phototroph organisms obtain energy? |
| A. | light |
| B. | oxygen |
| C. | sulphur |
| D. | bacteria |
| Answer» B. oxygen | |
| 22. |
Staphylococcus aureus bacteria are resistant to which of following? |
| A. | oxygen |
| B. | carbon dioxide |
| C. | sulphur |
| D. | methane |
| Answer» E. | |
| 23. |
Harmless bacteria can turn virulent by which of following? |
| A. | horizontal gene transfer |
| B. | vertical gene transfer |
| C. | phage infection |
| D. | toxin release |
| Answer» B. vertical gene transfer | |
| 24. |
What adaptations do most thermophile archaea have to protect their DNA from extreme heat? |
| A. | biochemical modification in DNA |
| B. | fragmented DNA |
| C. | sheared DNA |
| D. | larger DNA |
| Answer» B. fragmented DNA | |
| 25. |
Ecological relationship in which two organisms exist in close contact with each other are called |
| A. | Morphosis |
| B. | antagonists |
| C. | proximity |
| D. | symbiosis |
| Answer» E. | |
| 26. |
''R'' in R plasmids stands for what? |
| A. | rumination |
| B. | reason |
| C. | retaliate |
| D. | resistance |
| Answer» E. | |
| 27. |
Halophiles can survive in which of following extreme conditions? |
| A. | methane |
| B. | heat |
| C. | lack of oxygen |
| D. | high salinity |
| Answer» E. | |
| 28. |
Which of following is not an antibiotic? |
| A. | erythromycin |
| B. | tetracycline |
| C. | penicillin |
| D. | ribavirin |
| Answer» E. | |
| 29. |
Which of following can be poisoned by oxygen? |
| A. | Streptomyces |
| B. | Borrelia burgdorferi |
| C. | Leptospira |
| D. | methanogens |
| Answer» E. | |
| 30. |
Which of following subgroups of proteobacteria contains slime-secreting myxobacteria? |
| A. | alpha |
| B. | beta |
| C. | gamma |
| D. | delta |
| Answer» E. | |
| 31. |
Eukaryotic cells typically have a diameter of about how many micrometers? |
| A. | 1 |
| B. | 4 |
| C. | 7 |
| D. | 50 |
| Answer» E. | |
| 32. |
How many prokaryotic species have been assigned names so far by scientists? |
| A. | 10500 |
| B. | 12000 |
| C. | 1000 |
| D. | 30000 |
| Answer» B. 12000 | |
| 33. |
Which of following elements is important in production of amino acids? |
| A. | sulphur |
| B. | copper |
| C. | nitrogen |
| D. | magnesium |
| Answer» D. magnesium | |
| 34. |
Chromosome of a prokaryote is located in |
| A. | cell wall |
| B. | ribosome |
| C. | nucleoid |
| D. | endoplasmic reticulum |
| Answer» D. endoplasmic reticulum | |
| 35. |
Which of following is used for respiration in facultative anaerobes if oxygen is absent? |
| A. | sulphur |
| B. | light |
| C. | heat |
| D. | fermentation |
| Answer» E. | |
| 36. |
Appendages that pull two cells together is called |
| A. | Pilli |
| B. | pseudopods |
| C. | fimbriae |
| D. | hair |
| Answer» B. pseudopods | |
| 37. |
Rhizobium resides in roots of which of following plants? |
| A. | Genisteae |
| B. | non leguminous |
| C. | flowering |
| D. | leguminous |
| Answer» E. | |
| 38. |
Hfr cell has F factor in its |
| A. | plasmid |
| B. | chromosome |
| C. | cell wall |
| D. | ribosomes |
| Answer» C. cell wall | |
| 39. |
Which of following bacteria is source of many antibiotics? |
| A. | Streptomyces |
| B. | Borrelia burgdorferi |
| C. | Leptospira |
| D. | oscillatoria |
| Answer» B. Borrelia burgdorferi | |
| 40. |
Prokaryotic population originated about how many billion years ago? |
| A. | 1 |
| B. | 2 |
| C. | 3.5 |
| D. | 9 |
| Answer» D. 9 | |
| 41. |
Which of following does not have a circular chromosome present in them? |
| A. | bacteria |
| B. | archaea |
| C. | animals |
| D. | none of above |
| Answer» D. none of above | |
| 42. |
Clostridium botulinum causes which of following disease? |
| A. | botulism |
| B. | anthrax |
| C. | ulcer |
| D. | urinary tract infection |
| Answer» B. anthrax | |
| 43. |
Sulfur bacteria belong to which of following subgroups of proteobacteria? |
| A. | beta |
| B. | gamma |
| C. | epsilon |
| D. | alpha |
| Answer» C. epsilon | |
| 44. |
Sticky wall present outside many prokaryotes is called |
| A. | capsule |
| B. | cell wall |
| C. | membrane |
| D. | covering |
| Answer» B. cell wall | |
| 45. |
What temperature is required to kill endospores? |
| A. | 121 °C |
| B. | 300 °C |
| C. | 500 °C |
| D. | 1000 °C |
| Answer» B. 300 °C | |
| 46. |
Which of following is needed by obligate aerobes to respire? |
| A. | sulphur |
| B. | chemicals |
| C. | organic nutrient |
| D. | oxygen |
| Answer» E. | |
| 47. |
Which of following bacteria are responsible for most commonly transmitted sexual disease? |
| A. | salmonella |
| B. | Bdellovibrios |
| C. | Thiomargarita namibiensis |
| D. | Nongonococcal urethritis |
| Answer» E. | |
| 48. |
An ecological relationship in which one participant benefits and other is harmed is called |
| A. | parasitism |
| B. | symbiosis |
| C. | mutualism |
| D. | commensalism |
| Answer» B. symbiosis | |
| 49. |
Rhodobacter is an example of which of following |
| A. | heterotrophs |
| B. | Chemotrophs |
| C. | autotrophs |
| D. | phototrophs |
| Answer» B. Chemotrophs | |
| 50. |
Which of following never have their DNA associated with histone proteins? |
| A. | bacteria |
| B. | archaea |
| C. | fungi |
| D. | plants |
| Answer» B. archaea | |