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Biology MCQS[NEET-2021 to 2022]-Microorganisms

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1. What is true about Archaebacteria?




2. The Ti plasmid is often used for making transgenic plants. This plasmid is found in




3. Reproduction in most of the bacteria is by a process known as




4. An example of endomycorrhizal is




5. Human insulin is being commercially produced from a transgenic species of




6. Specialized cells called heterocysts are present in




7. The Gram negative bacteria detect and respond to chemicals in their surrounding by




8. Which of the following protects the bacteria from the enzymes present in the external medium?




9. A bacterium is capable of withstanding extreme heat, dryness and toxic chemicals. This indicates that it is probably above to form




10. Which one of the following is correct about Cosmid?




11. Which of the following groups of organisms are ecologically similar?




12. A bacterium which is capable of utilizing the most abundantly available gas in the atmosphere for one of its metabolic pathways, but cannot utilize the second most abundantly available for its another




13. Identify the correct pair of events when temperate phages infect bacteria : (I) No prophages are formed. (II) Bacterial cell undergoes many divisions (III) Bacterial cell undergoes immediate lysis




14. Which type of DNA is found in bacteria?




15. Plasmids are most often found in




16. Cell wall of Gram positive bacteria is made up of




17. Bacteria with flagella all over the body is




18. Which of the following is a free living nitrogen fixing bacterium present in the soil?




19. An example for symbiotic bacteria




20. The asexual spores formed by Colletotrichum falcatum, Sphaerotheca and Rhizopus stolonifer are




21. The bacterium (Clostridium botulinum) that causes botulism is




22. Red rot disease of sugarcane is caused by




23. Certain bacteria living in the soil poor in oxygen, convert nitrates into nitrites and then to free nitrogen and such bacteria are termed as




24. Chromosomes in a bacterial cell can be 1 - 3 in number and




25. N-acetylmuramic acid is found in




26. dsRNA is found in




27. Which one of the followings is a viral disease?




28. Cauliflower mosaic virus contains




29. ELISA is used to detect viruses where the key reagent is




30. Due to discovery of which of the following in 1980, the evolution was termed as RNA world




31. Tailed bacteriophages are




32. One important characteristic of viruses is that they




33. Virus are living, because




34. DNA is not present in one of the following




35. Which of the following statements is not true for retroviruses?




36. Viruses are no more "alive" than isolated chromosomes because




37. Which statement is correct for bacterial transduction?




38. Which of the following statements is true about viruses?




39. How does enveloped virus enter into host cells?




40. The genetic material in virus is




41. Protein coat of a virus enclosing nucleic acid is called




42. The Phages that show lysogenic cycle are called




43. Which one of the following enzymes is present in the bacteriophage?




44. Which one of the following viruses contains both DNA and RNA?




45. Bacteriophages kill




46. Virus multiplies in




47. Provirus is _____.




48. The non-living characteristic of viruses is




49. A T-series bacteriophage can be recognized by its




50. In AIDS, HIV kills