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Question:

Haemoglobin is An oxygen carrier in human blood An oxygen scavenger in root nodules A plant protein with high lysine content A protein used as food supplement

An oxygen carrier in human blood

An oxygen scavenger in root nodules

A protein used as food supplement

A plant protein with high lysine content

Solution:

Haemoglobin is a iron containing protein, which carries O2 in human blood. It is tetrameric protein having 2α and 2β chain. Fe present in haem structure binds to the CO2 or O2.