Which amino acid when repeated six to ten times at the N- or C-terminal ends of a protein allows that protein to bind to Ni²⁺ ions? A) Glu B) His C) Ala D) Tyr E) Asp

Question

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The amino acid that is known to bind to Ni²⁺ ions is histidine (His) due to the presence of its imidazole group, which can coordinate with metal ions. When repeated six to ten times, it can form a chelating site that can bind to the metal ions with high affinity. Ala, Glu, Tyr, and Asp do not have the necessary functional groups to bind to metal ions.

Which Amino Acid When Repeated Six to Ten Times at the N-