Chapter 3 Multiple Choice Questions Flashcards
The term culture refers to the ____ growth of microorganisms in ____.
a. rapid, incubator b. macroscopic, media c. microscopic, the body d. artificial, colonies
b. macroscopic, media
A mixed culture is:
a. the same as a contaminated culture b. one that has been adequately stirred c. one that contained two or more known species d. a pond sample containing algae and protozoa
c. one that contained two or more known species
Agar is superior to gelatin as a solidifying agent because agar:
a. does not melt at room temperature b. solidifies at 75C c. is not usually decomposed by microorganisms d. both a and c
d. both a and c
The process that accounts of magnification is:
a. a curved glass surface b. refraction of light c. illumination d. resolution
b. refraction of light
A subculture is a:
a. colony growing beneath the media surface b. culture made from a contaminant c. culture made in an embryo d. culture made from an isolated colony
d. culture made from an isolated colony
Resolution is ____ with a longer wavelength of light
a. improved b. worsened c. not changed d. not possible
b. worsened
A real image is produced by the:
a. ocular b. objective c. condensoer d. eye
b. objective
A microscope that has a total magnification of 1500x with the oil immersion lens has an ocular or what power?
a. 150x b. 1.5x c. 15x d. 30 x
c. 15x
The specimen for an electron microscope is always:
a. stained with dyes b. sliced into thin sections c. killed d. viewed directly
c. killed
Motility is best seen with a:
a. hanging drop preparation b. negative stain c. streak palte d. flagellar stain
a. hanging drop preparation
Bacteria tend to stain more readily with positively charged des because bacteria:
a. contain large amounts of alkaline substances b. contain large amounts of acidic substances c. are neutral d. have thick cell walls
b. contain large amounts of acidic substances
