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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
Cysteine
Histidine
Valine

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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?

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

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Structure and Properties of Amino Acids
Which of the following is an essential amino acid?

Lysine
All of these
Methionine
Tryptophan

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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
D
L
L and D

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

aromatic ring
arginine residues
peptide bonds
free c-termini

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Structure and Properties of Amino Acids
Which of the following is not a sensible grouping of amino acids based on their polarity properties?

Ala, Leu, and Val
Arg, His, and Lys
Phe, Trp, and Tyr
Asp, Ile, and Pro

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