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Structure and Properties of Amino Acids

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

Valine
Histidine
Cysteine
Isoleucine

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

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

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Structure and Properties of Amino Acids
The sequence of letters 'WYQN' will represent

Tryptophan, glutamine, tryptophan, asparagine
Glutamine, tyrosine, tryptophan, aspartic acid
Tryptophan, tyrosine, glutamine, asparagine
Tryptophan, tyrosine, glutamic acid, asparagine

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Structure and Properties of Amino Acids
Stereo chemical configuration of all a-amino acids derived from proteins is

None of these
L and D
D
L

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Structure and Properties of Amino Acids
In a polypeptide average mass of an amino acid residue is

150 daltons
80 daltons
110 daltons
118 daltons

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Structure and Properties of Amino Acids
Amino acids required in the human diet and not synthesized by the body are called

accessory
essential
specialized
trace

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