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Q. Which of these bacterial components is least likely to contain useful antigens? Cell wallFlagellaRibosomesCapsule Answer: Ribosomes

Q. Which of the following contains structures composed of N-acetylmuramic acid and N- acetylglucosamine? MycoplasmasAmoebaE.coliSpheroplast Answer: E.coli

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

Q. Selective media facilitate growth of only one kind of organism. Saboraud medium is used to selectively isolate coliform bacteriagram positive bacteriayeastsacid 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 mediumenrichment mediumdifferential mediumnone of these Answer: differential medium

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

Q. Stuart’s transport medium is used for transport of specimen containing Neisseria gonorrhoeaeSalmonellaVibrio choleraeShigella Answer: Neisseria gonorrhoeae

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