41. In the absonce of ox ygen, methylene blue A. blue 13. green C. purple D. col

Question

41. In the absonce of ox ygen, methylene blue A. blue 13. green C. purple D. colorless E. red will appear 42.. An that magnifies slight differences in the refractive index of cell structures is called a (n) B. electron D. densitometric microscope. 43. In viewing a microscopic specimen, immersion oil is used with the 100X objective to A. increase the reflection B. decrease refraction increase refraction increase magnification E. both B and D are correct 44. Which of the following can influence the efficiency of a chemical disinfectant? A. concentration of the agent tio o) C temperature D. presence of organic matter E. all of the above can affect the efficiency of chemical disinfection 45. Two principal methods that can be used to successfully stain bacteria endospores are I. Brewer's methodII. Schaeffer-Fulton method III. Gram stain method IV. Dorner method A. I and IV B. I and II C. II and IV D. II and III E. III and IV 46. Which of the following can be considered as a differential staining procedure? A. Gram stain B. Acid-fast stain C. Spore stain D. Leifson's flagella stain E. All except D

Explanation / Answer

41) In the absence of oxygen, methylene blue will appear colorless. Methylene blue is a redox indicator which lose its color in the absence of oxygen

42) An instrument that magnifies slight differences in the refractive index of cell structures is known as phase contrast microscope.

43) Immersion oil is used with the 100X microscope to decrease the refraction and increase the magnification.

44) All of the above can affect the efficiency of the chemical disinfectant.

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