Amino acids are classified as acidic, basic or neutral depending upon the relative number of amino and carboxyl groups in their molecule. Which of the following are acidic?

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Acidic amino acids carry two —COOH groups against one —NH₂: (ii) is glutamic acid (HOOC—CH₂—CH₂—CH(NH₂)—COOH) and (iv) is aspartic acid (HOOC—CH₂—CH(NH₂)—COOH). (i) has one —COOH (neutral) and (iii) is a γ-amino acid with equal groups (neutral).

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Options:(select one or more)

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