alleryThe biological molecule HAEMOGLOBIN contains which metal at its centre?
ACopper (Cu) ion at the centre
BMagnesium (Mg) ion at the centre
CIron (Fe) in a porphyrin ring
DCobalt (Co) at the centre
Answer & Solution
Correct answer: C. Iron (Fe) in a porphyrin ring
**Haemoglobin:** iron-porphyrin (haem) complex, carries O2 in vertebrate blood.
**CHLOROPHYLL:** Mg-porphyrin (plant photosynthesis).
**VITAMIN B12:** cobalt-corrin.
Three iconic biological coordination compounds.
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