Multiple choice general knowledge science & technology

What molecule in the blood carries oxygen?

  1. Chlorophyll

  2. Insulin

  3. Factor X

  4. Hemoglobin
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Hemoglobin is the iron-containing protein in red blood cells that binds oxygen in the lungs and releases it to tissues. Chlorophyll is for photosynthesis in plants, insulin regulates blood sugar, and Factor X is involved in blood clotting.

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