試題詳解

24. The chemical compound “ethylenediaminetetraacetic acid, EDTA” is a chelating agent to coordinate several metallic ions, such as ferric, cupper, and calcium ions. In the living organism, which amino acid is usually used as a chelating agent?
(A) Cysteine
(B) Glycine
(C) Leucine
(D) Tryptophan
(E) Proline