Q. Mac-Conkey medium is an example of transport mediumenrichment mediumdifferential mediumall of these Answer: differential medium

Q. Which of the following bacteria dies quickly after drying? Treponema pallidiumMycobacterium tuberculosisStaphylococcus aureusPseudomonas aeruginosa Answer: Treponema pallidium

Q. The concentration of agar to obtain semi solid media is 1.5-20%0.5% or less>10%>10%but<20% Answer: 0.5% or less

8. For the selection of endospore-forming bacteria, a mixed culture can be heated at 80°C for 10 minutes70°C for 10 minutes60°C for 10 minutes90°C for 10 minutes Answer: 80°C for 10 minutes

Q. To select cholera-causing bacterium, Vibrio cholerae, the pH of the medium is maintained at a pH of 8.58.906.793.5 Answer: 8.5

Q. Which of the following chemotherapeutic agents may affect the growth of Campylobacter jejuni? VacomycinPolymyxinTrimethoprimNone of these Answer: None of these

Q. The solidifying agent commonly used in preparation of media is/are agarsilica gelboth (1) and (2)none of these Answer: both (1) and (2)

Q. In the process of freeze drying, a dense cell suspension is placed in small vials and is frozen at -60 to -78°C-20 to -30°C-30 to -48°C-48 to -58°C Answer: -60 to -78°C

Q. Which of the following is used for the proper maintenance and preservation of pure cultures? Periodic transfer to fresh mediaPreservation by overlaying cultures with mineral oilPreservation by lyophilizationAll of the above Answer: All of the above

Q. Cell size and cell number can be measured using hemocytometercoulter counterpetroff-hausser counting chambernone of these Answer: coulter counter