Which form of the amino acid alanine is most abundant in aqueous solution at pH = 7.0? | Biochemistry

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Question

Which form of the amino acid alanine is most abundant in aqueous solution at pH = 7.0?

CH₃CH(NH₂)(COOH)

CH₃CH(NH₂)(COO–)

CH₃CH(NH³⁺)(COOH)

CH₃CH(NH³⁺)(COO–)

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