MICkOBIOL and IMMUNOL. LAB Student L. Ir the objective lenses of a microsoope ca
ID: 207374 • Letter: M
Question
MICkOBIOL and IMMUNOL. LAB Student L. Ir the objective lenses of a microsoope can be switched from one to snother without +S specimen, the lenses are said to be A. equifocal. B-totifocal. C parfocal. 2. A microscope that magnifies slight differences in the refractive index of cell structures is called a (o) microscope phase-contrast D. densitometric 3. The that produces a bright image of the specimen against a dark background is called a (n) A. B. electron C pright-field D dark-field 4. Prior to staining, smears of microorganisms are heat-fixed in order to A allow eventual visuatization of intemal structures. B, ensure removal of dust particles from the slide surface. attach it firmly to the slide. D create small pores in cells that facilitates binding of stain to cell structures. 5. If the decolorizer is left on too long in the Gram-staining procedure, gram-positive organisms will be stained and gr ve organisms will be stained A. purple; blue purple; pink D pink; pink will and gram-negative organisms will be stained be stained A. purple; purple purple, colorless purple; pinkExplanation / Answer
1. C. Parafocal.
If objective lens stay in focus even after changing magnification, lens are said to be parafocal.
2. A. Phase contrast.
3. D. Dark field.
4. C. Attach it firmly to the slide.
5. D. Pink, pink.
6. A. Purple, purple.
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