Consider the following statements for deoxy-hemerythrin and deoxy-hemocyanin:
A. they are involved in O2 transport in biological systems
B. they contain two metal ions in their active site
C. active site metal centres are bridged by amino acid residues
D. they prefer to bind only one O2 per active site
The correct statements are
1
A, B and D
2
A, C and D
3
B, C and D
4
A and C
5
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