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