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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
None of these
Hydroxylysine
Dopamine

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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
where the carboxyl group is uncharged
of maximum electrolytic mobility
where the amino group is uncharged

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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 __________ .

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

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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
L
D

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Structure and Properties of Amino Acids
Which of the following amino acid contain an imidazolium moiety?

Cysteine
Alanine
Histidine
Valine

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

Acetyl-CoA
Pyruvic acid
Acetyl carnitine
Oxaloacetic acid

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