Homework Answers
24) Lest test tube : Positive
Right test tube : Negative
The test tube on the left side is positive as it is red in colour and the test tube in right side negative as it is yellow incolour.
25) The positive result indicates that the organism produces acidic end products which decreases the pH of the culture media thus the pH indicator in the media, methyl red stays red in colour.
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• 24. These tubes show the results of the Methyl Red test. Which is positive? Left...
Methyl Red Methyl Red ve MR/V/P Questions For MR Test what does red mean? Which bacteria...
Methyl Red Methyl Red ve MR/V/P Questions For MR Test what does red mean? Which bacteria is positive for MR? For VP, which acid are we detecting? B A Can a bacteria be positive for both MR and VP?
Microbiology Q1 Q2 Q3 One organism that is positive for citrate is You added methyl red...
Microbiology
Q1
Q2
Q3
One organism that is positive for citrate is You added methyl red to your MR test and observe a red color. The test result can be interpreted as You forgot to label a tube with a slant but you remember that its original color was green and now after incubation, the slant color is blue. What is the name of the test?
A microbe produced positive methyl red results and negative Voges-Proskauer results. What may be concluded about...
A microbe produced positive methyl red results and negative Voges-Proskauer results. What may be concluded about the microbe's metabolism? The microbe respires aerobically. The microbe produces mixed acids but does not use the butanediol pathway. The microbe uses the butanediol pathway but does not produce mixed acids. The microbe produces mixed acids and uses the butanediol pathway.
• 26. Which tube shows an organism that produces H2S? Left or Right • 27. Which...
• 26. Which tube shows an organism that produces H2S? Left or Right • 27. Which tube shows an organism that is positive for the Indole test? Left or Right E. COLT WIS S. TYPHIMURTUM WIS
8. Discuss the results of the Benedict's test. Which compounds gave a positive result, and why?...
8. Discuss the results of the Benedict's test. Which compounds gave a positive result, and why? Which gave a negative result, and why? Use your data and the preliminary reading material to help answer this question Use your understanding of the Benedict's test and the iodoform test to answer the following 6. Two compounds have the molecular formula C3H.O.Draw their structural formulas and names using the following test results a Compound A forms a red orange precipitate with Benedict's reagent,...
Microbiology ONLY answe 1 2 3 4 5 6 Which reagent is added to test for...
Microbiology
ONLY answe
1
2
3
4
5
6
Which reagent is added to test for indole? A“positive” lactose test is yellow. What is present in the medium that causes the color change? You added methyl red to your MR test and observe a red color. The test result can be interpreted as You forgot to label a tube with a slant but you remember that its original color was green and now after incubation, the slant color is blue....
Methyl Red and Voges-Proskauer Tests OBSERVATIONS AND INTERPRETATIONS 5-3 1 Refer to Tables 5-3 and 5-4,...
Methyl Red and Voges-Proskauer Tests OBSERVATIONS AND INTERPRETATIONS 5-3 1 Refer to Tables 5-3 and 5-4, page 290, as you record your results (color) and interpretations in the table below Organism Uninoculated control MR Result VP Result Interpretation QUESTIONS Some protocols call for a shorter incubation time for the MR and VP tests. Other protocols alloue for up to 10 days incubation with virtually no risk of producing a false positive. a. Which of the two tests would likely produce...
Refer to the table which summarizes the results of testing for a certain disease Positive Test...
Refer to the table which summarizes the results of testing for a certain disease Positive Test Negative Result Test Result 89 28 Subject has the disease Subject does not have the disease 158 If one of the results is randomly selected, what is the probability that it is a false positive (test indicates the person has the disease when in fact they don't)? Round the probability to three decimal places. What does this probability suggest about the accuracy of the...
Which of the following sugars would NOT yield a positive Fehling's test (red color change)? Which...
Which of the following sugars would NOT yield a positive Fehling's test (red color change)? Which of the following sugars would NOT yield a positive Fehling's test (red color change)? lactose maltose sucrose All of the listed responses would yield a positive result.
29. a test could not effectively discriminate one microbe from another microbe as it normally should,...
29. a test could not effectively discriminate one microbe from another microbe as it normally should, which of the following would apply about that test? (see the Lab Manual). 2. inadequate sensitivity b. inadequate specificity 30. We will also be running the Methyl Red and Voges-Proskauer tests (Lab 5-3). The Methyl Red (MR) test is designed to detect microbes that produce which of the following? a. Mixed acids b. Stable acids c. Chemicals that reduce the pH to 4.4 or...
Methyl Red Methyl Red ve MR/V/P Questions For MR Test what does red mean? Which bacteria is positive for MR? For VP, which acid are we detecting? B A Can a bacteria be positive for both MR and VP?
Microbiology
Q1
Q2
Q3
One organism that is positive for citrate is You added methyl red to your MR test and observe a red color. The test result can be interpreted as You forgot to label a tube with a slant but you remember that its original color was green and now after incubation, the slant color is blue. What is the name of the test?
• 26. Which tube shows an organism that produces H2S? Left or Right • 27. Which tube shows an organism that is positive for the Indole test? Left or Right E. COLT WIS S. TYPHIMURTUM WIS
8. Discuss the results of the Benedict's test. Which compounds gave a positive result, and why? Which gave a negative result, and why? Use your data and the preliminary reading material to help answer this question Use your understanding of the Benedict's test and the iodoform test to answer the following 6. Two compounds have the molecular formula C3H.O.Draw their structural formulas and names using the following test results a Compound A forms a red orange precipitate with Benedict's reagent,...
Microbiology
ONLY answe
1
2
3
4
5
6
Which reagent is added to test for indole? A“positive” lactose test is yellow. What is present in the medium that causes the color change? You added methyl red to your MR test and observe a red color. The test result can be interpreted as You forgot to label a tube with a slant but you remember that its original color was green and now after incubation, the slant color is blue....
Methyl Red and Voges-Proskauer Tests OBSERVATIONS AND INTERPRETATIONS 5-3 1 Refer to Tables 5-3 and 5-4, page 290, as you record your results (color) and interpretations in the table below Organism Uninoculated control MR Result VP Result Interpretation QUESTIONS Some protocols call for a shorter incubation time for the MR and VP tests. Other protocols alloue for up to 10 days incubation with virtually no risk of producing a false positive. a. Which of the two tests would likely produce...
Refer to the table which summarizes the results of testing for a certain disease Positive Test Negative Result Test Result 89 28 Subject has the disease Subject does not have the disease 158 If one of the results is randomly selected, what is the probability that it is a false positive (test indicates the person has the disease when in fact they don't)? Round the probability to three decimal places. What does this probability suggest about the accuracy of the...
29. a test could not effectively discriminate one microbe from another microbe as it normally should, which of the following would apply about that test? (see the Lab Manual). 2. inadequate sensitivity b. inadequate specificity 30. We will also be running the Methyl Red and Voges-Proskauer tests (Lab 5-3). The Methyl Red (MR) test is designed to detect microbes that produce which of the following? a. Mixed acids b. Stable acids c. Chemicals that reduce the pH to 4.4 or...
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