Answer :
The primary function of a protein is to build and repair body tissues and structures. Hemoglobin is the protein
molecule found in the red blood cells or erythrocytes that carries
oxygen fom the lungs to the body’s tissues and returns carbon dioxide from
the tissues back to the lungs. The protein molecule in hemoglobin contains iron
containing compound that is vital in transporting oxygen and carbon dioxide in
the blood. It has no attraction for carbon monoxide. The
cells that would need a large number of mitochondria to function and survive
are the eukaryotes. They need this in order for protein to be consumed and
converted to energy.