E-PolyLearning

16. Disease-producing species occurring in a mixed culture can be selected by taking advantage of _________
a. its pathogenic properties
b. special carbon source
c. special nitrogen source
d. toxic chemicals
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Answer: (a).its pathogenic properties

17. Treponema sp. can be selected by taking advantage of ____________
a. small cell size
b. motility
c. dilute media
d. small cell diameter and bacterial motility
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Answer: (d).small cell diameter and bacterial motility

18. A large cluster of colonies are obtained in streak plate method.
a. True
b. False
c. May be
d. Can't say
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Answer: Use of dilute media

19. Roll-tube technique is used to isolate ___________
a. aerobes
b. anaerobes
c. facultatives
d. stringent anaerobes
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Answer: (d).stringent anaerobes

20. In pour-plate method,the medium should be maintained at what temperature?
a. 37 degree C
b. 67 degree C
c. 45 degree C
d. 0 degree C
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Answer: (c).45 degree C

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