Cell Cultures and Characteristics – Section 1

21. A medium containing crystal violet dye plus sodium deoxycholate will allow

A. gram (-)ve intestinal bacteria to grow
B. gram (+)ve intestinal bacteria to grow
C. aquatic bacteria to grow
D. none of these

Correct Answer: A. gram (-)ve intestinal bacteria to grow

22. Which of the following bacteria can grow in alkaline pH?

A. Shigella
B. Lactobacilli
C. Salmonella
D. Vibrio cholerae

Correct Answer: D. Vibrio cholerae

23. All bacteria that inhabit the human body are

A. heterotrophs
B. chemolithotrophs
C. autotrophs
D. phototroph

Correct Answer: A. heterotrophs

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 as

A. differential medium
B. enriched medium
C. enrichment medium
D. selective medium

Correct Answer: C. enrichment medium

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

Correct Answer: A. Dilution and plating

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