Acid-fast organisms such as Mycobacterium tuberculosis contain___in their cell w

Question

Acid-fast organisms such as Mycobacterium tuberculosis contain___in their cell walls which prevents ready staining by simple stain. a. lipid (mycolic acid) b. peptidoglycan c. carbohydrates d. proteins Acid-fast organisms such as Mycobacterium tuberculosis are not readily stained by simple stain until using____to drive the stain into cells. a. longer incubation time b. mordant c. heat d. fixation Prior to staining, smears of microorganisms are heat-fixed in order to a. ensure removal of dust particles from the slide surface. b. create small pores in cells that facilitate binding of stain to cell structures. c. allow eventual visualization of internal structures. d. kill and attach them firmly to the slide. Fill in the blank Name the parts of microscope a: ____ b; ___ c: d:___ e:___- f:____ What is numerical aperture for the 40X objective lens? Which lens has lowest a fold magnification?

Explanation / Answer

33-a

34-c

35-b

36a-Stage Control
37b-fine adjustment
38c-coarse focus
39d-eyepiece or Ocular lense
40e-Objective lense
41f-Stage
42-illuminator
43-NA Value Of 40x=0.65
a- label as 4x the first One.

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