The number of histidine amino acid nitrogen atoms coordinated to bimetallic active site of oxyhemocyanin, and oxyhemerythrin, respectively, are
(a)2, 3 and 3, 3 .
(b)3, 3 and 2, 3
(c)3, 3 and 2, 2
(d)2, 4 and 3,2
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
Oxyhemocyanin: each of the two Cu atoms is bound by three histidines (3, 3). Oxyhemerythrin: one Fe has three histidines and the other two (3, 2) — written as '3,3 and 2,3'.