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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Q. Which of the following problem makes it impossible to satisfy all of Koch’s postulates? Microorganism causes serious symptoms in humans Microorganism cannot be isolated in pure culture Species of microorganism is in question Genes from the microorganism cannot be amplified by PCR Answer: Microorganism cannot be isolated in pure culture
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Q. Intestinal bacteria can grow in the presence of __________ whereas nonintestinal bacteria are usually inhibited. bile salts low concentration of various dyes sugars low levels of nitrogen Answer: bile salts
Q. Which of the following techniques may be performed quantitatively to determine the number of bacteria of a particular type? Pour plate Spread plate Both (1) and (2) Streak plate technique Answer: Both (1) and (2)
Q. Cell counting can be carried out by direct microscopic count using petroffhansser counting chamber plate counting membrane filter count all of the above Answer: all of the above
