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The colors of blue (with no reducing sugar present), green, yellow, orange, red, and then brick red or brown (with high reducing sugar present) are developped when heated in water bath at 100 °C for 4-10 minutes.
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What observation indicates a positive test for lipid?
If it is mixed well.
Are substances that test positive with the Ames test necessarily carciongenic in humans?
The substances that are test positive with Ames test may or may not be carcinogenic for humans. Similarly, some substances that cause cancer in laboratory animals do not give a positive result Ames test. It is not possible to decide the carcinogenicity of any substances only depending on the Ames test.
Your last mensturaion period is on 16th June and 14th July you tested pregnancy using pregnancy kit and you got slight color in test is it positive?
According to the instruction sheets included with all brands of pregnancy tests that I myself am familiar with, any color change, no matter how faint, indicates a positive result.
What is the difference between sensitivity and specificity?
Sensitivity measures how well a test identifies disease-positive (D+). Specificity measures the probability that a positive test result (T+) correlates to a real D+ person. These measures tend to be inverse of each other-- that is, the more sensitive a test, the less specific it is likely to be, and vice versa.
What is the color of biruet solution?
The biuret solution used in the biuret test for peptide bonds is blue in the absence of peptide bonds or biuret which also results in a positive result. A positive result for peptide bonds or biuret is apparent as the biuret solution turns purple/violet in color.
What are the Benedicts test results for glucose?
Benedict's test is a simple chemical test used to detect the presence of reducing sugars like glucose in a solution. The test result is positive if a brick-red precipitate forms, indicating the presence of reducing sugars. If the solution remains blue, it indicates a negative result.
What does a positive Molisch's test on an unknown substance indicate?
A positive Molisch's test result indicates the presence of carbohydrates.
Name a nonfermentative test in which gas production indicates a positive test result?
The oxidase test is a nonfermentative test in which the presence of gas bubbles indicates a positive result. Gas bubbles result from the reaction of the test reagent with cytochrome c oxidase, which is present in certain bacteria like Pseudomonas species.
Will hydrolysed dextrine give positive response to Benedict test?
Yes, hydrolyzed dextrin will give a positive response to the Benedict test as it contains reducing sugars that can react with the Benedict's reagent to form a colored precipitate indicating the presence of reducing sugars.
What is a good conclusion of the benedicts test?
A good conclusion of the Benedict's test would be to state whether the test result was positive or negative for reducing sugars. Positive result would indicate the presence of reducing sugars, while a negative result would suggest their absence. This information can be important for further analysis or identification of certain carbohydrates.
What substrate gives a positive reaction for benedicts reagent?
Reduction of Benedict's reagent occurs with reducing sugars such as glucose, fructose, and galactose, giving a positive test result. This test is used to detect the presence of reducing sugars in various food products.
Do eggs test positive in benedicts test?
Yes, eggs can test positive in the Benedict's test because they contain glucose, which is a reducing sugar that reacts with the reagent in the test to form a colored precipitate.
What is a false-positive?
A false-positive is a test result which incorrectly indicates that a particular condition or attribute is present. False-negatives can also occur.
What is a test result indicating that a condition is present when in fact it is not?
A false positive test result occurs when a test wrongly indicates the presence of a condition that is actually not present. This can lead to unnecessary further testing, treatment, or emotional distress for the individual receiving the result.
What indicates a test for catalase production is positive?
A positive catalase test result is indicated by the presence of bubbles or effervescence when hydrogen peroxide is added to the test organism. This indicates the production of the enzyme catalase, which breaks down hydrogen peroxide into water and oxygen gas.
Would sucrose test positive or negative with benedicts reagent?
No, surcose is a disaccharide without a hemiacetal group
What is a positive test result for starch?
A positive test result for starch is the formation of a blue-black color when iodine solution is added to the sample being tested. This color change indicates the presence of starch in the sample.
