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draw the following tripeptide a-g-c in its zwitter-ion form

draw the following tripeptide a-g-c in its zwitter-ion form

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Answer #1

Remember that zwitter ions are molecules with chargeable groups that are in a state of 0 charge, due to compensating some charges with others. Our amino acids are N-Alanine- Glycine-Cysteine-C.

Alanine has only its amino group, glycine doesn't have any free ionic group to provide, and cisteine can only provide its carboxylic group. So the zwitter ion of this peptide requires the carboxylic group from the cysteine to be negatively charged (COO-), while the amino group from alanine is positively charged (NH3+):

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