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Cell Biology - Questions and Answers for Competitive Exams | GkSeries

25. The total magnification of a microscope with the low power lens (10X) and ocular lens (15X) in position would be _________
  • [A] 25
  • [B] 15
  • [C] 150
  • [D] 1500

Answer: Option [C]

26. Heat fixation accomplishes all the following expect ________.
  • [A] helps the dye to penetrate the cells
  • [B] kills the bacteria on the slide
  • [C] decreases distortion of the cells prior to the addition of strains
  • [D] fixes the organisms to the slid

Answer: Option [C]

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27. If a bacterium measures 0.3 micrometer, it would measure how many angstroms?
  • [A] 300
  • [B] 30
  • [C] 3000
  • [D] 3

Answer: Option [C]

28. Which of the following would not be consistent with eukaryotic organisms?
  • [A] membrane bound organelle
  • [B] presence of histones
  • [C] cell membranes lacking sterols
  • [D] paired chromosomes

Answer: Option [B]

29. Which of the following methods is NOT used to determine bacterial numbers?
  • [A] turbidity
  • [B] serial dilution
  • [C] direct microscopic counts
  • [D] all the above

Answer: Option [D]

30. Endospores ________
  • [A] are generally formed for protection and reproduction
  • [B] are formed only when conditions become unfavorable.
  • [C] contain dipicolinic acid and calcium
  • [D] contain laminated layers of peptidoglycan called the exosporium

Answer: Option [C]

31. A specially calibrated counting chamber used with direct microscopic counts is called _________.
  • [A] petroff hausser counter
  • [B] haemocytometer counter
  • [C] Geiger-Muller counter
  • [D] Geiger-Müller photoelectron counter

Answer: Option [A]

32. The ratio of diameter of lenses to its focal length is referred as ________.
  • [A] magnification
  • [B] resolution
  • [C] numerical aperture
  • [D] focal length

Answer: Option [A]

33. Use of single stain to color the bacteria is commonly called as ________ staining
  • [A] simple
  • [B] Gram
  • [C] differential
  • [D] negative

Answer: Option [A]

34. A preserved culture maintained to keep its characteristics as originally defined is a _______
  • [A] reference culture
  • [B] standard culture
  • [C] enrichment culture
  • [D] selective culture

Answer: Option [A]

35. Pasteur is credited with all the following except ________.
  • [A] construction of swan necked vessels
  • [B] development of a vaccine for rabies
  • [C] development of the technique for rabies
  • [D] became the director of the Pasteur institute in Paris, France

Answer: Option [D]

36. One of the most important contributions of Robert Koch in his development of the germ theory of disease was the ________.
  • [A] use of test animals in research
  • [B] use of the microscope
  • [C] development of the technique of pure culturing
  • [D] development of the busen burner

Answer: Option [C]

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