The correct statement in respect of protein haemoglobin is that it

The correct statement in respect of protein haemoglobin is that it
  1. acts as an oxygen carrier in the blood
  2. forms antibodies and offers resistance to diseases
  3. enzymes are specific biological catalysts that can normally function at very high temperature $(\mathrm{T} \sim 1000 \mathrm{~K})$
  4. enzymes are specific biological catalysts that possess well-defined active sites

Solution

Haemoglobin acts as an oxygen carrier in the blood since it reacts with oxygen to form unstable oxyhaemoglobin which easily breaks to give back haemoglobin and oxygen.

Asked in: JEE-TOPICTESTS-CHEMISTRY

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