NURSING EXAM QUESTIONS
BIOCHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Yellow, Xanthophobic reaction.
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Yellow, xanthoproteic reaction.
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Blue, xanthophobic reaction.
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Blue, xanthoproteic reaction.
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Detailed explanation-1: -The Xanthoproteic test uses a nitration reaction to determine the presence of proteins in a solution. When the sample is treated with a hot, concentrated nitric acid it reacts with aromatic amino acids such as phenylalanine, tyrosine and tryptophan and forms a yellow colored product known as Xantho protein.
Detailed explanation-2: -The xanthoproteic reaction is a method that can be used to detect a presence of protein soluble in a solution, using concentrated nitric acid. The test gives a positive result in amino acids carrying aromatic groups, especially in the presence of tyrosine.
Detailed explanation-3: -Result of Xanthoproteic Test Positive Test: Indicated by the appearance of a dark yellow or orange-colored solution. It confirms the presence of aromatic groups in the proteins and amino acids.