Q. When a substance is added to a solid medium which inhibits the growth of unwanted bacteria but permits the growth of wanted bacteria, it is known as differential medium enriched medium enrichment medium selective medium Answer: selective medium
Q. Treponema species from human oral cavity can be selected by using pH of the medium incubation temperature cell size and motility all of these Answer: cell size and motility
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Q. In the pour plate method, the mixed culture is diluted directly in tubes of liquid agar medium sterile liquid usually water both (a) and (b) none of these Answer: liquid agar medium
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Q. Viable plate count can be obtained using Spread plate method Pour plate method both (1) and (2) Hemocytometer Answer: both (1) and (2)
Q. Which of the following hint(s) suggest/s that a given specimen is likely to contain anaerobic bacteria? Gas in specimen Foul odour Presence of sulphur granules All of these Answer: All of these
Q. Which of the following methods is most likely to be quantitative? Dilution and plating Gram staining Wet mount None of these Answer: Dilution and plating
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Q. 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 differential medium enriched medium enrichment medium selective medium Answer: enrichment medium
Q. All bacteria that inhabit the human body are heterotrophs chemolithotrophs autotrophs phototroph Answer: heterotrophs
Q. Which of the following bacteria can grow in alkaline pH? Shigella Lactobacilli Salmonella Vibrio cholerae Answer: Vibrio cholerae
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Q. A medium containing crystal violet dye plus sodium deoxycholate will allow gram (-)ve intestinal bacteria to grow gram (+)ve intestinal bacteria to grow aquatic bacteria to grow none of these Answer: gram (-)ve intestinal bacteria to grow
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