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Structure and Properties of Amino Acids

Structure and Properties of Amino Acids
Which of the following amino acid is known as half-cystine residue?

Cysteine
Isoleucine
Histidine
Valine

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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?

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

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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?

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

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

150 daltons
80 daltons
118 daltons
110 daltons

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Structure and Properties of Amino Acids
When the amino acid alanine (R-group is CH3) is added to a solution with a pH of 7.3, alanine becomes

nonpolar
an isotope
a zwitterions
a cation

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

aromatic ring
peptide bonds
arginine residues
free c-termini

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