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Structure and Properties of Amino Acids

Structure and Properties of Amino Acids
Which of the following is not the hydrophobic and aromatic amino acid?

Tryptophan
None of these
Tyrosine
Phenylalanine

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

All of these
Lysine
Tryptophan
Methionine

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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
a zwitterions
an isotope
a cation

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

free c-termini
aromatic ring
peptide bonds
arginine residues

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

Cysteine
Isoleucine
Histidine
Hydroxyproline

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Structure and Properties of Amino Acids
Which amino acid when exposed to ninhydrin produces a brown color?

Proline
Alanine
Asparagine
Valine

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