ssify each amino acid by the chemical properties of its side chain (R group) at

Question

ssify each amino acid by the chemical properties of its side chain (R group) at pH 7. Select the amin cid that fits best in each category. Each amino acid will be used only once 1. This amino acid has a positively charged R group: Select answer 2. This amino acid has a negatively charged R group: Select answer 3. This amino acid has a neutral polar R group: Select answer 4. This amino acid has a nonpolar aliphatic R group: Select answer 5. This amino acid has an aromatic R group: G Select answer

Explanation / Answer

1. Lysine

2. Glutamate

3. Threonine

4. Valine

5. Phenyl alanine

Note: Among 20 common acids 5 are with charged side chain (R group). Two are negatively charged (aspartic acid and glutamic acid). Three are positively charged  (lysine, arginine, and histidin). 10 out of 20 including valine are nonpolar. Phenyl alanine contrain aromatic side chain (phenyl).

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