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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
Isoleucine
Cysteine
Histidine

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Structure and Properties of Amino Acids
How many different amino acids are there?

20
100
An infinite number
3

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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?

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

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

150 daltons
118 daltons
80 daltons
110 daltons

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Structure and Properties of Amino Acids
Which of the following is a nonprotein amino acid?

Hydroxylysine
Cystine
None of these
Dopamine

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

Alanine
Valine
Asparagine
Proline

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