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
Q. Important example(s) of enriched medium/media is/ are Loeffler’s serum slope Bordet-gengou medium Blood agar All of these Answer: All of these
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Q. A disease producing species occurring in a mixed culture can often be selected on the basis of its pathogenic properties special carbon source special nitrogen source none of these Answer: pathogenic properties
Q. For the selection of lactobacilli present in cheddar cheese, the pH of the medium is maintained at 6.35 5.35 4.35 5.75 Answer: 5.35
Q. Agar is used for solidifying culture media because it does not affect by the growth of bacteria it does not add to the nutritive properties of the medium the melting and solidifying points of agar solution are not the same all of the above Answer: all of the above
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Q. Pseudomonas aeruginosa forms a blue water soluble pigment called pyocyanin chlororaphin pyoverdin ß-carotene Answer: pyocyanin
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