Which amino acid would, when incorporated into a polypeptide chain (not at the N or C terminus), make the charge of the polypeptide more positive?

Explanation: Arginine is an amino acid that is used for the biosynthesis of protein. It is made up of an α-amino group, an α-carboxylic acid group, & a side chain consisting of a 3-carbon aliphatic straight chain ending in a guanidino group. At physiological pH, the carboxylic acid is deprotonated (−COO−), the amino group is protonated (−NH3+), and the guanidino group is also protonated to give the guanidinium form (-C-(NH2)2+), making arginine a charged, aliphatic amino acid.

throwdolbeau throwdolbeau · Answer 2 · 2022-01-18T11:24:03+01:00

The amino acid when incorporated into a polypeptide chain (not at the N or C terminus), make the charge of the polypeptide more positive is Arginine.

Arginine

Like all of the amino acids, arginine has two functional groups, a carboxyl group (COOH) and an amine group (NH₂).
Arginine is an amino acid that is used for the biosynthesis of protein. It is made up of an α-amino group, an α-carboxylic acid group, & a side chain consisting of a 3-carbon aliphatic straight chain ending in a guanidino group.
At physiological pH, the carboxylic acid is deprotonated [tex](COO)[/tex], the amino group is protonated [tex](NH_3^+)[/tex], and the guanidino group is also protonated to give the guanidinium form [tex](-C-(NH_2)^{2+})[/tex], making arginine a charged, aliphatic amino acid.

Thus, the amino acid is Arginine.

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