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Selective Media
Food Micro Lab Final Exam
Question | Answer |
---|---|
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 |