22. Which of the following bacteria can grow in alkaline pH?
A.Shigella
B.Lactobacilli
C.Salmonella
D.Vibrio cholerae

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23.  All bacteria that inhabit the human body are
A.heterotrophs
B.chemolithotrophs
C.autotrophs
D.phototroph

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24. When a substance is added to a liquid medium which inhibits the growth of unwanted bacteria and favors the growth of wanted bacteria, it is known a
A.differential medium
B.enriched medium
C.enrichment medium
D.selective medium

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25. Which of the following methods is most likely to be quantitative?
A.Dilution and plating
B.Gram staining
C.Wet mount
D.None of these

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26. Which of the following hint(s) suggest/s that a given specimen is likely to contain anaerobic bacteria?
A.Gas in specimen
B.Foul odour
C.Presence of sulphur granules
D.All of these

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27. Viable plate count can be obtained using
A.Spread plate method
B.Pour plate method
C.both (a) and (b)
D.Hemocytometer

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28. In the pour plate method, the mixed culture is diluted directly in tubes of
A.liquid agar medium
B.sterile liquid usually water
C.both (a) and (b)
D.none of these

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