試題詳解

86. When oxygen is bound to myoglobin, the amino acid ________ is complexed to the iron ion of the heme group while ________ forms a hydrogen bond to the oxygen.
(A) cysteine; serine
(B) cysteine; histidine
(C) serine; cysteine
(D) histidine; histidine
(E) histidine; cysteine