Q39 · CSIR NET Chemistry, December 2014
Paper: CSIR NET December 2014 · Subject: Inorganic Chemistry · Chapter: Bioinorganic Chemistry · Topic: Nitrogen Fixation · Marks: 2 · Difficulty: Medium
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'.
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