Homework Answers
Answer :
XLD agar stands for Xylose Lysine Deoxycholate agar.
Presence of Phenol red and a pH of 7.4 is what selectively differentiates between Salmonella and Shigella.
If an organism can ferment Xylose and produces acid, this lowers pH and hence the appearence will change from Red or Pink to Yellow. Salmonella can ferment xylose and hence appears Yellow.
Since Shigella cannot ferment Xylose and thgus cannot produce hydrogen sulfide, it remains as Red colonies.
Hence the answer is
Red colonies
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microbiology help
TOT Zoo Add Page Insert Table Chart Text Shape Media Comment These questions will serve in lieu of a lab report for Exercise 15, 16, and 17 You will find the answer to these questions in the background, procedure, results and interpretation sections of manual Exercise 15, 16, and 17, videos, Actions of Selective and Differential Media Chart, and the Principle/Theory article in homework section.) General Questions 1. What is the purpose (function) of selective media? (How does...
Compare the recipes of Nutrient Agar and XLD Agar.If an organism can grow on both media, on whick would you expect it to grow better? Why? XLD is a selective mediuam. Is it also a defined or an undefined medium? Why is that formulation desirabl 5 What would be the likely consequence of a. incubating the medium for 48 hours? b. not adding desoxycholate? c. not adding sucrose and lactose? d. not adding lysine? e. not adding ferric ammonium citrate?...
Question 1 (1 point) An unknown organism was inoculated into a phenol red tub and produce a yellow coloration. The same organism was inoculated into a purple broth tube resulted in growth after the incubation period. Green slant tubes were also inoculated and resulted in a blue coloration. However, this organism was negative for motility within a SIM tube. Which of the following is the unknown species? Salmonella typhimurium Shigella sonnei Enterobacter aerogenes Klebsiella pneumoniae Escherchia coli O Proteus mirabilis...
microbiology help
TOT Zoo Add Page Insert Table Chart Text Shape Media Comment These questions will serve in lieu of a lab report for Exercise 15, 16, and 17 You will find the answer to these questions in the background, procedure, results and interpretation sections of manual Exercise 15, 16, and 17, videos, Actions of Selective and Differential Media Chart, and the Principle/Theory article in homework section.) General Questions 1. What is the purpose (function) of selective media? (How does...
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