Hemocyanin is an oxygen-transport metalloprotein present in some inver

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Hemocyanin is an oxygen-transport metalloprotein present in some invertebrate animals. This protein contains :

one copper atom
two copper atoms
one iron atom
one magnesium atom
This question was previously asked in
UPSC CAPF – 2015
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Hemocyanin is an oxygen-transport protein found in many invertebrates. It is a metalloprotein that contains copper atoms.
Hemocyanin utilizes copper atoms to bind and transport oxygen. Each oxygen binding site in hemocyanin contains two copper atoms.
In contrast, hemoglobin, the oxygen-transport protein in vertebrates, uses iron atoms (specifically, heme groups containing iron) for oxygen binding. Hemocyanin is responsible for the blue colour of the blood (hemolymph) in organisms like mollusks (e.g., snails, squids) and some arthropods (e.g., spiders, crustaceans) when oxygenated.

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