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Structure and Properties of Amino Acids

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

Cysteine
Hydroxyproline
Histidine
Isoleucine

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Structure and Properties of Amino Acids
Which amino acids would most likely reside in the membrane-anchoring domain of a membrane embedded protein?

Lysine, arginine and histidine
Phenylalanine, valine, and aspartate
Leucine, threonine, and lysine
Isoleucine, valine and phenylalanine

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

L
D
None of these
L and D

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

150 daltons
110 daltons
118 daltons
80 daltons

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

Alanine
Valine
Cysteine
Histidine

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

ion conversion
amphions
ambions
zwitterions

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