zwitter hypothesis

zwit·ter hy·poth·e·sis

that an amphoteric molecule (for example, an amino acid) has, at its isoelectric point, equal numbers of positive and negative charges, thus becoming a zwitterion.

zwit·ter hy·poth·e·sis

(tsvit'er hī-poth'ĕ-sis)
That an amphoteric molecule (e.g., an amino acid) has, at its isoelectric point, equal numbers of positive and negative charges, thus becoming a zwitterion (dipolar ion).