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Selective Media

Food Micro Lab Final Exam

QuestionAnswer
What is TSAYE agar composed of? Casein, soy peptones (supply amino acids), NaCl, agar
T or F: TSAYE is considered a selective media. False
What is MOX agar composed of? Peptones, beef heart extract, NaCl, agar, Listeria hydrolized esculin, lithium chloride, antimicrobials
MOX agar selects for ______. Listeria
What is the purpose of NaCl in agar? Maintains osmotic balance
Xylose is fermented by all _____ bacteria. enteric
XLD agar allows differentiation of _____ and _____. Shigella, Salmonella
What component of XLD agar differentiates for Salmonella? Lysine
XLD is considered _____ media. selective
XLD inhbits gram ____ bacteria. positive
What component of XLD media is responsible for the black centers present with growth? H2S indicator - sodium thiosulfate, ferric ammonium citrate
T or F: E.coli O157:H7 does not ferment sorbitol. True
What color do non-pathogenic strains of E.coli appear on CT-SMAC media? pink/red
Cefixime in CT-SMAC agar inhibits ____ spp. Proteus
MOX agar is considered _____ media. differential
CT-SMAC is considered _____ media. selective
Rainbow agar selects for which microorganism? E. coli
Define selective media. Allows the growth of some organisms while inhibiting the growth of others.
Define differential media. Differentiates closely related organisms based on biochemical characteristics.
Rainbow agar is considered ____ media. selective
Created by: goberoi
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