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Structure and Properties of Amino Acids

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

Alanine
Histidine
Valine
Cysteine

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

Pyruvic acid
Oxaloacetic acid
Acetyl-CoA
Acetyl carnitine

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

None of these
Hydroxylysine
Dopamine
Cystine

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

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

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

L and D
L
None of these
D

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Structure and Properties of Amino Acids
Molecules that bear charged groups of opposite polarity are known as

amphions
ion conversion
zwitterions
ambions

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