Describe the protonation and charge state of lysine

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Lysine contains two amine groups (pKa = 9.0 and 10.0) and a carboxylic acid group (pKa= 2.2). In a solution of pH 9.5, which describes the protonation and charge state of lysine?

A. Carboxylic acid is deprotonated and negative; amine (pKa 9.0) is depronated and neutral whereby the amine (pKa= 10.0) is protonated and positive

B. Carboxylic acid is deprontated and negative; amine (pKa= 9.0) is pronated and positive wherby the amine (pKa= 10.0) is deprotoned and nuetral

C. Carboxylic acid is deprotonated and nuetral; both amines are pronated and positive

D. Carboxylic acid is depronated and negative; both amines are depronated and neutral

Reference no: EM132749387

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