In zwitterionic form tryptophan, the functional groups observed are

Aldehyde and ketone group

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Carboxylic group only

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Amino and carboxylic group

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Aldehyde and mino group

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Solution

The correct option is C Amino and carboxylic group
Tryptophan is an aromatic non-polar amino acid that contains an α-amino group, an α-carboxylic acid group, and a side chain indole. In its zwitterionic form, the functional groups observed are an amino and carboxylic group.
The image shown here is of L-tryptophan zwitterion.
So, the correct answer is 'Amino and carboxylic group'.

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