Multiple choice

Which of the given metals is seen in the hemocyanins of the blood of cold-blooded animals?

  1. Copper

  2. Magnesium

  3. Iron

  4. Phosphorus

  5. Nitrogen
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A Correct answer
Explanation

Hemocyanins are respiratory proteins in the form of metalloproteins containing two copper atoms that reversibly bind a single oxygen molecule (O2). Oxygenation causes a colour change between the colourless Cu(I) deoxygenated form and the blue Cu(II) oxygenated form. Unlike the hemoglobin in red blood cells found in vertebrates, hemocyanins are not bound to blood cells but are instead suspended directly in the haemolymph.

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