The copper in hemocyanin binds to oxygen molecules, and when the protein is oxygenated, it gives lobster blood its distinctive blue colour. Blue blood is not unique to lobsters; other arthropods that use hemocyanin as an oxygen carrier also have it. The bluish colour of lobster blood is not due to freshness or quality, but rather is a natural feature of the species.
What chemical element gives the blood of a lobster a bluish tint?
Because of the presence of the chemical element copper, lobster blood has a bluish tint. The blue colour is caused by hemocyanin, a copper-containing protein that acts as an oxygen carrier in many arthropods, including lobsters.
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