Q. Which of the following bacteria can grow in acidic pH? Vibrio choleraeLactobacilliShigellaSalmonella Answer: Lactobacilli

Q. Treponema sp. can be selected by taking advantage of ____________ small cell sizemotilitydilute mediasmall cell diameter and bacterial motility Answer: small cell diameter and bacterial motility

Q. Disease-producing species occurring in a mixed culture can be selected by taking advantage of _________ its pathogenic propertiesspecial carbon sourcespecial nitrogen sourcetoxic chemicals Answer: its pathogenic properties

Q. Vibrio cholerae can grow in a medium with a pH of _______ 5.57.08.52.0 Answer: 8.5

Q. In physical method of selection, endospore-forming bacteria can be obtained by heating the mixed culture to _____________ 70 degree C for 10 minutes80 degree C for 10 minutes60 degree C for 10 minutes90 degree C for 10 minutes Answer: 80 degree C for 10 minutes

Q. Which of the following is not a physical method for selection of pure culture? Heat treatmentpH of the mediaCell size and motilityUse of dilute media Answer: Use of dilute media

Q. Enrichment media allows the growth of a large number of varied bacterial species. TrueFalse Answer: False

Q. Isolation of pure culture refers to ___________ purification of cultureintroduction of inoculumseparation of a single colonyto grow microorganisms on a surface Answer: separation of a single colony

Q. An outbreak of sepsis caused by Staphylococcus aureus has occurred in the newborn nursery. You are called upon to investigate. According to your knowledge of the normal flora, what is the most likely source of the organism? ThroatColonNosenone of the above Answer: Nose

Q. Roll-tube technique is used to isolate ___________ Stringent AnaerobesFacultativesAerobesNone Of These Answer: Stringent Anaerobes