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

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

Q. Pseudomonas aeruginosa forms a blue water soluble pigment called pyocyanin chlororaphin pyoverdin ß-carotene Answer: pyocyanin

Q. Mac-Conkey medium is an example of transport medium enrichment medium differential medium all of these Answer: differential medium

Q. Which of the following bacteria dies quickly after drying? Treponema pallidium Mycobacterium tuberculosis Staphylococcus aureus Pseudomonas 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 minutes 70°C for 10 minutes 60°C for 10 minutes 90°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 8.5 8.90 6.79 3.5 Answer: 8.5