The side groups of proteins may have one (or several) of a variety of different chemical and physcial properties.As part of a protein, which of the following amino acid residues will have basic properties?

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The question asks which amino acid residue among the given options will have basic properties when part of a protein.
Option a: Lysine. Lysine has a long aliphatic side chain terminating in a primary amino group (NH3+ at physiological pH), which confers basic properties. This basic side chain can accept protons and participate in salt bridges and hydrogen bonding, typical for basic residues in proteins.
Option b: Alanine. Alanine has a simple methyl side chain (CH3). It is nonpolar and lacks ionizable groups at physiological pH, so it does not exhibit basic properties.
Option c: Serine. Serine contains a hydroxyl (-OH) side chain, which is polar but not ionizable under normal physiological conditions; it is considered a polar uncharged residue, not basic.
Option d: Threonine. Threonine has a beta-hydroxyethyl side chain with an additional methyl group. Like serine, its side chain is polar but not ionizable to carry a positive charge under physiological conditions, so it is not basic.
In summary, among the listed residues, only Lysine carries a basic, positively charged group in its side chain that contributes basic properties, whereas Alanine, Serine, and Threonine do not.

My LMS Subjects Quiz 3

The side groups of proteins may have one (or several) of a variety of different chemical and physcial properties.As part of a protein, which of the following amino acid residues will have basic properties?

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