Which of the following results from TSI test is FALSE? A. Yellow slant, yellow butt, split agar means glucose, lactose and/or sucrose fermented gas produced B. Yellow butt, red slant means glucose only fermented C. Black slant, red butt means peptones were catabolized D. Red slant, black butt means glucose fermented hydrogen sulfide gas produced E. Red butt, red slant means all sugars fermen
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Which of the following results from TSI test is FALSE?
A. Yellow slant, yellow butt, split agar means glucose, lactose and/or sucrose fermented gas produced
B. Yellow butt, red slant means glucose only fermented
C. Black slant, red butt means peptones were catabolized
D. Red slant, black butt means glucose fermented hydrogen sulfide gas produced
E. Red butt, red slant means all sugars fermented, no gas produced
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- Fill up the table below. For inferences, indicate the identity of the macronutrient being tested in milk Chemical Test Observations Inferences a. Phenolphthalein test b. Biuret Test c. Molisch Test Film Formation What is observed during boiling of milk? Explain your observation and identify the milk component that was formed. Separation of Casein and Whey 3.1 What is observed during the addition of acetic acid in milk? Explain your observations by identifying the milk components that were formed. 3.2 Fill up the table below to summarize the confirmatory test for casein and whey. Test Sample Filtrate Residue / Precipitate Milk Component Reagents Observations Inferences 3.3 Give the function or importance of casein and whey. Test for Milk Fat Briefly describe how milk fat is being tested?If the inoculated lactose broth cube exhibits acid production but without gas formation, will you consider this as a negative or positive result? Explain Why is the MPN test qualitative rather than quantitative? Why is the MPN test qualitative rather than quantitative? Why is MPN test qualitative rather than quantitativeAnswer the numbers 1 & 2 1. Positive with Molisch Test and Benedict Test but negative with both Iodine Test and Seliwanoff's Test, immediate precipitate formation with Barfoed's Test, and muddy brown coloration with Bial's Test. a.Glucose b.Fructose c.Ribose/Arabinose d.Maltose e.Sucrose 2. Positive with Benedict's Test and Seliwanoff's Test, and immediate precipitate formation with Barfoed's Test. a.Glucose b.Fructose c.Ribose/Arabinose d.Maltose e.Sucrose
- Which of the following is false about the TSI test? A. It looks for CO2 or H2S gas production B. Hydrogen sulfide precipitates our as black C. It can tell if sucrose or lactose is fermented D. It changes from red to yellow when acid is produced E. It tests for lactose, sucrose, glucose fermentationWhat will happen to the color of the Coomassie reagent as more protein is added? Group of answer choices A) It will turn more Blue B) It will turn more Green C) It will turn more RedDescribe what the plate in each scenario looks like: A. Bacteria grows on mannitol salt agar and is negative for mannitol fermentation B. Bacteria grows on EMB agar and is positive for lactose fermentation C. Bacteria grows on MacConkey agar and is negative for lactose fermentation
- Which of the the following results of the extracellular enzyme tests is FALSE? Question 3 options: A Liquid gelatin positive for gelatinase B Clear area around bacterial growth on a starch plate after iodine is added means amylase is present C Clear zone around bacterial growth on a milk plate means caseinase is present D Solid gelatin after is positive for gelatinase E No clear zone around bacterial growth on milk plate means absence of casienaseWhich of the following tests is used to distinguish glucose from fructose?* A. Molisch test B. Seliwanoff's test C. Bial's Orcinol D. Kowarsky test E. None of the given optionsFour tubes were prepared as shown in the figure: In any test tube, the starch is digested faster: A B C D
- Which of the following statements best explains the positive result of the acid hydrolysate of sucrose for benedict's test? A. The acid hydrolysate of sucrose contains glucose only B. The acid hydrolysate of sucrose contains fructose only C. Both glucose and fructose are present in the acid hydrolysate of sucrose D. Neither glucose nor fructose is present in the acid hydrolysate of sucroseDoes fructose can produce a positive result in Seliwanoff Test? Elaborate your answerLysine decarboxylase media is yellow after incubating an organism in it at 37 degrees for 24 hours. Which of the following can be interpreted from this result? A. The organism did not grow so lysine decarboxylase activity could not be determined. B. The organism is negative for lysine decarboxylase. C. The media is too acidic to determine lysine decarboxylase activity. D. The organism is positive for lysine decarboxylase