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Tyrosine.
Millon's Reagent-a solution that is usually made by dissolving Mercury in concentrated nitric acid and diluting with water and that when heated with phenolic compounds gives a red coloration used as a test especially for tyrosine and proteins containing tyrosine. (from merriam-webster's medical dicitonary)
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All amino acid having an aromatic ring give a positive xanthoproteic test under identical condition?
No, not all amino acids with an aromatic ring give a positive xanthoproteic test. The xanthoproteic test is mainly positive for amino acids containing aromatic rings with phenolic groups such as tyrosine and phenylalanine. Aromatic amino acids like tryptophan do not give a positive xanthoproteic test under identical conditions.
Is staphylococcus aureus methyl red positive?
Staphylococcus aureus is typically methyl red negative. Methyl red test is used to determine the ability of an organism to perform mixed-acid fermentation of glucose, with a positive result indicating a significant drop in pH. Staphylococcus aureus is not known to produce enough acid to yield a positive result with the methyl red test.
Why proline amino acid gives yellow colour in reaction with ninhydrin?
Yes. Within "The Chemical Reactions of Amino Acids / Reactions of Amino Groups" there are several examples - one of which is the ninhydrin reaction. A very widely applied reaction of the alpha amino group [that is the N in the peptide bond -CCN-CCN-], it is used to estimate the quantity of amino acids [in a sample] in very small amounts. All amino acids and polypeptides with a free alpha group react with ninhydrin and yield [or produce] an intensely purple colored product - except for Proline and Hydroxyproline {both in which the alpha amino group is termed to be 'substituted' - something to do with carbon rings} which "yield derivatives with a characteristic yellow color." See also 'Schiff's bases'.
Why could an actual yield be more than a theoretical yield?
An actual yield can be more than a theoretical yield due to incomplete reaction conversion, impurities in reactants, or unexpected side reactions. These factors can result in more product being formed than predicted by theoretical calculations.
Why seliwanoff's test is positive only for keto sugars?
Seliwanoff's test is positive only for keto sugars because they contain a ketone group in their structure that reacts with the reagents in the test to form a pink color. Aldose sugars do not contain this ketone group and therefore do not yield a positive result in the Seliwanoff's test.
What amino acid will yield a positive result with lead acetate test?
Cysteine will yield a positive result with the lead acetate test due to the formation of lead sulfide. Lead sulfide appears as a black precipitate when cysteine is present in the solution.
Can meloxicam yield a positive result on ANA testing?
can taking meloxicam yield a positive result on antinuclear antibody (ANA) test
All amino acid having an aromatic ring give a positive xanthoproteic test under identical condition?
No, not all amino acids with an aromatic ring give a positive xanthoproteic test. The xanthoproteic test is mainly positive for amino acids containing aromatic rings with phenolic groups such as tyrosine and phenylalanine. Aromatic amino acids like tryptophan do not give a positive xanthoproteic test under identical conditions.
What color develops when ninhydrin react with amino acids?
These are the amino acids that will yield positive result to the ninhydrin test: Non-polar amino acids: Glycine, Alanine, Valine, Leucine, Isoleucine, Phenylalanine, Methionine, Tryptophan Polar Neutral Amino acids: Serine, Cysteine, Threonine, Asparagine, Glutamine, Tyrosine Polar Acidic Amino Acids: Aspartic acid and Glutamic acid Polar Basic Amino Acids: Histidine, Lysine, Arginine
What samples did not give a positive test with xanthoproteic test why?
The xanthoproteic test is used to detect the presence of aromatic amino acids, particularly tyrosine and tryptophan, by turning yellow upon reaction with nitric acid. Samples that do not contain these amino acids, such as certain non-aromatic amino acids (e.g., glycine, alanine) or peptides and proteins lacking these residues, will not yield a positive test. Additionally, any substances that do not contain proteins or peptides, such as carbohydrates or lipids, will also not give a positive result. Thus, the absence of aromatic amino acids or proteins in the sample is the reason for a negative xanthoproteic test.
When your multiplying a positive and a negative with the answer be a positive?
When you multiply a positive number by a negative number, the result is always negative, not positive. This is because multiplication can be thought of as repeated addition, and adding a negative value reduces the total. Therefore, the product of a positive and a negative number will never yield a positive result; it will always be negative.
What does hydrolysis of a simple protein yield?
Amino acids.
What is the result of hydrolysis of a dipeptide?
Hydrolysis of a dipeptide results in the breaking of the peptide bond between the two amino acids in the dipeptide to yield two separate amino acids. This process requires the addition of water to break the bond, resulting in the separation of the amino acid components.
What is x divided by negative nine?
X divided by negative nine is expressed mathematically as ( \frac{x}{-9} ) or ( -\frac{x}{9} ). This represents a value that is the result of taking ( x ) and dividing it by negative nine, which will yield a negative result if ( x ) is positive, and a positive result if ( x ) is negative.
What is the product of four negative integers?
The product of four negative integers is always positive. This is because multiplying two negative integers results in a positive integer, and when you multiply two positive integers, the result remains positive. Therefore, the product of four negative integers will yield a positive value.
Why do negative and negative become positive?
A negative and a negative can yield a positive result in some cases.SubtractionSubtracting a negative number is the same as adding its negative value, which is positive. So if the subtracted number is larger in value, the answer will be positive.(-4) - (-3) = (-4) + 3 = (-1) * the subtracted number was not large enough(-4) - (-8) = (-4) + 8 = 4 *the subtracted number was large enough to yield a positiveMultiplication and DivisionWhenever a negative number and a negative number are multiplied or divided, the negative signs "cancel out" and the result is positive.(-2) x (-3) = 6(-6) / (-3) = 2A multiplication or division involving one negative and one positive will, however, have a negative result.
What are the rules to multiply and divide integers?
When multiplying or dividing integers, the following rules apply: If both integers have the same sign (both positive or both negative), the result is positive. If the integers have different signs (one positive and one negative), the result is negative. For example, (3 \times 4 = 12) and (-3 \times -4 = 12) yield positive results, while (3 \times -4 = -12) and (-3 \times 4 = -12) yield negative results. These rules apply equally to division.
