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Structure and Properties of Amino Acids

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

Cystine
Dopamine
None of these
Hydroxylysine

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Structure and Properties of Amino Acids
Coomassie Blue stains the proteins by reacting with

free c-termini
peptide bonds
aromatic ring
arginine residues

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Structure and Properties of Amino Acids
Which pair of amino acids absorbs the most UV light at 280 nm?

Threonine & Histidine
Trp & Tyrosine
Phenylalnine & Proline
Cystein & Asparagine

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Structure and Properties of Amino Acids
What is the end product of leucine metabolism?

Pyruvic acid
Acetyl carnitine
Acetyl-CoA
Oxaloacetic acid

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Structure and Properties of Amino Acids
The α-amino acids have a carboxyl group with a pK around __________ , and an amino group with a pK near __________ .

1.1, and 12.1
6.5, and 8.0
2.2, and 9.4
3.3, and 10.5

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

D
L and D
L
None of these

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