Coordination compounds are of great importance in biological systems. In this context,which of the following statements is incorrect?
- AThe green color of plant leaves is due to the chlorophyll complex,which contains $Ca$ metal ion.
- BThe red color of blood is due to the hemoglobin complex,which contains $Fe$ metal ion.
- CCyanocobalamin is known as vitamin $B_{12}$,which contains a cobalt metal ion.
- DCarboxypeptidase-$A$ is an enzyme that contains zinc.
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