Question

How can an amino acid be basic or neutral in nature?

Answer 1

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$\mathfrak{\green{Answer.}}$Acidic and Basic Amino Acids. There are three amino acids that have basicside chains at neutral pH. These are arginine (Arg), lysine (Lys), and histidine (His). ... Their side chains have carboxylic acid groups whose pKa's are low enough to lose protons, becoming negatively charged in the process.
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Answer 2

Acidic and Basic Amino Acids. There are three amino acids that have basicside chains at neutral pH. These are arginine (Arg), lysine (Lys), and histidine (His). ... Their side chains have carboxylic acid groups whose pKa's are low enough to lose protons, becoming negatively charged in the process.