Multiple choice general knowledge

The main constituent of hemoglobin is

  1. Chlorine

  2. Iron

  3. Calcium

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hemoglobin, the oxygen-carrying protein in red blood cells, contains iron (Fe) in its heme groups. This iron binds to oxygen, giving blood its red color. Chlorine, calcium, and other minerals are not constituents of hemoglobin.

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