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GATE 2021 CY – Question 19

Inorganic Chemistry · Bioinorganic Chemistry: Ion (Na+ and K+) transport, oxygen binding, transport and utilization, electron transfer reactions, nitrogen fixation, metalloenzymes containing magnesium, molybdenum, iron, cobalt, copper and zinc. · 1 mark · Multiple choice

Which one of the following is a non-heme protein?

  1. hemoglobin
  2. hemocyanin
  3. myoglobin
  4. cytochrome P-450

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Correct answer: (B) hemocyanin

Explanation

Haemoglobin, myoglobin and cytochrome P450 contain an iron–porphyrin haem group. Haemocyanin instead binds oxygen at a dicopper active site and contains no haem. The correct non-haem protein is therefore **haemocyanin, B**.