Multiple choice general knowledge science & technology

The main component 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 contains iron in the form of heme groups, which bind oxygen molecules for transport throughout the body. Each hemoglobin molecule contains four iron atoms. This is why iron deficiency leads to anemia - not enough iron to make functional hemoglobin.

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