Map milaning apling Learning phenylalanine assify each amino acid by the chemical properties arginine acid that fits best in each category. Each amino acid threonine glutamate leucine 1. This amino acid has a positively charged R group: arginine bup) at pH 7. Select the amino 2. This amino acid has a negatively charged Rgroup: 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 1: 5. This amino acid has an aromatic R group: Select