Cell Biology - Questions and Answers for Competitive Exams | GkSeries

49. Magnetite-bearing magnetosomes have also been found in eukaryotic magnetotactic _________

• [A] algae
• [B] fungi
• [C] bacteria
• [D] protozoan

Answer: Option [A]

50. The role of pili in cloning of bacteria in E.coli is ________.

• [A] conjugation
• [B] transformation
• [C] tranfection
• [D] transduction

Answer: Option [A]

51. Various commercial products of economic value made by microbes are ______

• [A] medicines
• [B] organic acids
• [C] amino acids
• [D] all the above

Answer: Option [D]

52. Many individuals of the same species living together in a defined area form a/an ________.

• [A] community
• [B] genus
• [C] population
• [D] ecosystem

Answer: Option [A]

53. While using any pair of carbon compounds as long as other nutrients are not limiting, the bacteria shows ______ growth.

• [A] diauxic
• [B] continuous
• [C] batch
• [D] synchronous

Answer: Option [A]

54. Contagious disease spreads by ________.

• [A] inhalation
• [B] ingestion
• [C] inculation
• [D] contact

Answer: Option [D]

55. The widely used fumigant is ________.

• [A] ethylene
• [B] chlorine
• [C] formaldehyde
• [D] CO2

Answer: Option [C]

56. Somatic cells undergo ________

• [A] mitosis
• [B] meiosis
• [C] mitosis and meiosis
• [D] neither mitosis nor meiosis

Answer: Option [A]

57. Gametic cells undergo ________

• [A] mitosis
• [B] meiosis
• [C] binary fission
• [D] neither mitosis and meiosis

Answer: Option [B]

58. Separation of small molecule can be done by ________.

• [A] viscometer
• [B] centrifugation
• [C] flow cytometry
• [D] spectrophotometer

Answer: Option [B]

59. A slippery outer covering in some bacteria that protects them from phagocytosis by host cells is ________.

• [A] capsule
• [B] cell wall
• [C] flagellum
• [D] peptidoglycan

Answer: Option [A]

60. Which year Beijerinck found the free living nitrogen fixing bacteria Azotobacter __________.

• [A] 1909
• [B] 1919
• [C] 1921
• [D] 1901

Answer: Option [D]