At physiological pH, amino acids are:

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Amino acids contain both a positively charged amino group (-NH3+) and a negatively charged carboxyl group (-COO-) in their structure. At physiological pH (around 7.4), the amino group can donate a proton to become neutral (-NH2), while the carboxyl group can lose a proton to also become neutral (-COOH). Therefore, amino acids exist as zwitterions, which are molecules with both a positive and negative charge, making them electrically neutral.

At Physiological PH, Amino Acids Are