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QUESTION
Q117) Blue copper protein complex contained in some Mollusca in their plasma for oxygen transport is ... [ HPPMT 2001 ]

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Mollusca is invertebrate animals
Haemocyanins are proteins that transport oxygen throughout the bodies of some invertebrate animals. These metalloproteins contain two copper atoms that reversibly bind a single oxygen molecule (O2). They are second only to hemoglobin in frequency of use as an oxygen transport molecule.
Answer : (a)