Mature human red blood cells (RBCs) do not contain __________.
A
Iron
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B
Cytoplasm
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C
Mitochondria
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D
Haemoglobin
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Solution
The correct option is D Mitochondria A mature RBC in mammals are devoid of nucleus and most organelles, including mitochondria so that almost the entire cell can be packed with hemoglobin for gaseous transport and becomes even more efficient as an oxygen carrier.