Amino Acids and Proteins Multiple Questions and Answers.




1.Identify the amino acids containing nonpolar, aliphatic R groups ?
A. Phenylalanine, tyrosine, and tryptophan
B. Glycine, alanine, leucine
C. Lysine, arginine, histidine
D. Serine, threonine, cysteine

2.The two amino acids having R groups with a negative net charge at pH 7.0 are ?
A. Aspartate and glutamate
B. Arginine and histidine
C. Cysteine and methionine
D. Proline and valine

3. If pK1 = 2.34 and pK2 = 9.60, then the isoelectric point pI is ?
A. 5.87
B. 5.97
C. 3.67
D. 11.94

4.Which of the following is a true statement ?
A. Tryptophan and tyrosine are significantly more polar than phenylalanine
B. Leucine is commonly used as an ingredient in the buffers of SDS page
C. Aspartate is an essential amino acid
D. Lysine is a non-essential amino acid

5.Which among the following is a non-essential amino acid ?
A. Serine
B. Threonine
C. Lysine
D. Histidine

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