The α - amino acids, usually exist in the form of zwitter ions. It means they have:

No acidic or basic group

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Basic group - COO^-and acidic group NH₄⁺

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Basic group -COO^- and acidic group - NH₃⁺

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Basic group - COO^- and acidic group - COO^2-

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Solution

The correct option is C
Basic group -COO^- and acidic group - NH₃⁺

This is the simplest α -amino acid glycine and this shows the formation of a zwitter ion.

We can clearly see that the zwitter ion has one basic group - COO^- and one acidic group - NH₃⁺

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