The Respiratory Pigment You Would Find in a Blue Crab

Question

The respiratory pigment you would find in a blue crab or octopus is
A)hemocyanin.
B)hemoglobin.
C)hemophilin.
D)ferritin.
E)calmodulin.

Accepted Answer

Blue crabs and octopuses have hemocyanin as their respiratory pigment. Hemocyanin contains copper atoms which bind to oxygen, giving it a blue color. Hemoglobin, hemophilin, ferritin, and calmodulin are all different proteins that have different functions in the body and are not involved in oxygen transport.