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What is the glucose test result of streptococcus faecalis?
It is positive for the metabolizing of glucose.
Is fehling test positive for gluconic acid?
No. Fehling's test is positive for glucose which forms gluconic acid as the product.
In glucose what is the result of fehling test?
The test is positive for reducing sugars(Glucose). Green brown ppt with traces of red was formed when Fheling's solution was added to the spatula's measure of glucose in 1cm3 of water
What substance does Iodine test for?
carbohydrates, for one
What is the chermical you test for starch?
Starch has high affinity for Iodine and in presence of iodine crystals starch turns blue from being colourless. This the fundamental that is used for chemically identifying the starch.
Why did a solution of saliva and oats test positive with benedict's test and iodine test if the oats alone tested positive only in the iodine test and the saliva alone was negative for both?
polysaccharides and simple sugar
Is there a method for detecting starch without using iodine?
if you put iodine in food and it contains starch it should change color.
What is the glucose test result of streptococcus faecalis?
It is positive for the metabolizing of glucose.
What color is positive test result for glucose?
the color of a positive test results is bright green
Is fehling test positive for gluconic acid?
No. Fehling's test is positive for glucose which forms gluconic acid as the product.
Why use iodine solution to test for starch?
The test is positive with starch because the iodine takes up a position in the centre of the starch helix which is blue black.
Why sucrose does not give a positive Benedict's test but hydrolyzed sucrose does give a positive beneditcts test?
Sucrose is formed from glucose and fructose.Sucrose is formed from glucose and fructose. Glucose and fructose gives positive test for benedict becuz both of them are reducing sugars whereas sucrose is not a reducing sugar so it gives negative test for benedict. On prolonged heating,sucrose will form glucose and fructose (reducing sugars)which ultimately gives a positive result .
Do glucose give a positive result for anthrone test?
Yes .
Why doesn't cellulose give a positive iodine test?
cellulose is derived from D-glucose units, which condensed through beta(1->4)-glycosidic bond. This give cellulose to be a straight polymer therefore, it can't coil around iodine to produce blue color as starch does.
Why is the Benedict test not exclusive to glucose?
The Benedict test will return a positive value for any reducing sugar. It will work with fructose, for example. Benedict solution oxidizes all the reducing sugars such as glucose, galactose and fructose. This implies that a positive result of Benedict's test can be any of the reducing sugars, not necessarily glucose. It will oxidize the carbonyl (which present in all type of sugar classes). So if we get a positive result in the Benedict test, it is not necessarily glucose; it could be galactose or fructose that also a reducing sugar. So Benedict test can't be used to assure glucose.
Would glucose give a positive result with the Biuret test?
No because glucose does not consist of two or more peptide bonds
What is the test results for iodine test?
Iodine test is a test used to determine the presence of starch in a particular substance.A positive result will yield a black color.For example, adding a few drops of iodine solution to potato will stain the amylocytes black since these are the starch-containing structures of potatoes as seen in a microscope.
