Q. Peptone water and nutrient broth are selective mediaenriched mediabasal medianone of these Answer: basal media

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 mediumenriched mediumenrichment mediumselective medium Answer: selective medium

Q. Treponema species from human oral cavity can be selected by using pH of the mediumincubation temperaturecell size and motilityall of these Answer: cell size and motility

Q. In the pour plate method, the mixed culture is diluted directly in tubes of liquid agar mediumsterile liquid usually waterboth (a) and (b)none of these Answer: liquid agar medium

Q. Viable plate count can be obtained using Spread plate methodPour plate methodboth (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 specimenFoul odourPresence of sulphur granulesAll of these Answer: All of these

Q. Which of the following methods is most likely to be quantitative? Dilution and platingGram stainingWet mountNone of these Answer: Dilution and plating

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 mediumenriched mediumenrichment mediumselective medium Answer: enrichment medium

Q. All bacteria that inhabit the human body are heterotrophschemolithotrophsautotrophsphototroph Answer: heterotrophs

Q. Which of the following bacteria can grow in alkaline pH? ShigellaLactobacilliSalmonellaVibrio cholerae Answer: Vibrio cholerae