If R = a basic N atom, it is a ________ amino acid?
basic
If the side chain (R group) of an amino acid is a basic nitrogen atom (NH2), the amino acid is known as a basic amino acid. Examples of basic amino acids are arginine (Arg), lysine (Lys), and histidine (His). Therefore, if R is a basic N atom, the amino acid would be a basic amino acid.
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