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Structure and Properties of Amino Acids

Structure and Properties of Amino Acids
Protein fluorescence arises primarily from which residue?

Arginine
Phenylalanine
Tyrosine
Tryptophan

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Structure and Properties of Amino Acids
The isoelectric point of an amino acid is defined as the pH

where the molecule carries no electric charge
of maximum electrolytic mobility
where the amino group is uncharged
where the carboxyl group is uncharged

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Structure and Properties of Amino Acids
Which of the following pairs of amino acids would carry a negative charge on their side chain at pH 8.0?

Histidine & Lysine
Leucine & Glycine
Aspartate & Glutamate
Asparagine & Glutamine

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Structure and Properties of Amino Acids
Which of the following amino acid is known as half-cystine residue?

Isoleucine
Valine
Histidine
Cysteine

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Structure and Properties of Amino Acids
Which of the following is not the hydrophobic and aromatic amino acid?

Phenylalanine
Tryptophan
Tyrosine
None of these

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Structure and Properties of Amino Acids
Which amino acid when exposed to ninhydrin produces a brown color?

Proline
Alanine
Valine
Asparagine

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