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Histidine, a heterocyclic amino acid has following structure at pH<1.82

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At pH>1.82, it should have which structure?

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Important Questions on Biomolecules

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Chemistry>Organic Chemistry>Biomolecules>Proteins
Which of the following tests cannot be used for identifying amino acids?
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Assume a spherical mammalian cell has a diameter of 27 microns. If a polypeptide chain with alpha-helical conformation has to stretch across the cell, how many amino acids should it be comprised of?
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Chemistry>Organic Chemistry>Biomolecules>Proteins
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Chemistry>Organic Chemistry>Biomolecules>Proteins
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Observation of "Rhumann's purple" is a confirmatory test for the presence of:
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Chemistry>Organic Chemistry>Biomolecules>Proteins
The predominant form of histamine present in human blood is pKa, Histidine=60
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Chemistry>Organic Chemistry>Biomolecules>Proteins
Which of the following is not an essential amino acid?
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Chemistry>Organic Chemistry>Biomolecules>Proteins
Among the following, the essential amino acid is:
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The number of peptide bonds in the compound

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Chemistry>Organic Chemistry>Biomolecules>Proteins
In a protein molecule various amino acids are linked together by:
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Consider the following sequence for aspartic acid:


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The pH (Isoelectric point) of aspartic acid is:
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The correct sequence of amino acids present in the tripeptide given below is:
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Chemistry>Organic Chemistry>Biomolecules>Proteins
The non-essential amino acid among the following is:
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Which compound can exist in a dipolar (zwitter ion) state?
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Which of the following is a basic amino acid?
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Which of the following statements is not correct?
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Chemistry>Organic Chemistry>Biomolecules>Proteins
Among the α -amino acid-threonine, tyrosine, methionine, arginine and tryptophan, those which contain an aromatic group in their side chain are
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Chemistry>Organic Chemistry>Biomolecules>Proteins
The correct structure of histidine in a strongly acidic solution pH=2 is