Q. The association of endotoxin in gram-negative bacteria is due to the presence of Steroids Peptidoglycan Lipopolysaccharides Polypeptide Answer: Lipopolysaccharides

Q. Selective media facilitate growth of only one kind of organism. Saboraud medium is used to selectively isolate coliform bacteria gram positive bacteria yeasts acid fast organisms Answer: yeasts

Q. The medium which allows the growth of more than one microorganisms of interest but with morphologically distinguishable colonies is known as selective medium enrichment medium differential medium none of these Answer: differential medium

Q. Plate counts are often reported as cfu cfu/ml Both (a) and (b) thousands/ml Answer: cfu/ml

Q. Stuart’s transport medium is used for transport of specimen containing Neisseria gonorrhoeae Salmonella Vibrio cholerae Shigella Answer: Neisseria gonorrhoeae

Q. Peptone water and nutrient broth are selective media enriched media basal media none 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 medium enriched medium enrichment medium selective medium Answer: selective medium

Q. Treponema species from human oral cavity can be selected by using pH of the medium incubation temperature cell size and motility all of these Answer: cell size and motility

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

Q. Viable plate count can be obtained using Spread plate method Pour plate method both (1) and (2) Hemocytometer Answer: both (1) and (2)