Multiple choice

Iron is an extremely important transition metal in biological systems. It helps to perform various biological functions, such as

  1. transport of O2 to tissues
  2. release of O2 to muscle cells
  3. cofactor to some enzymes

  1. Only 1

  2. Only 2

  3. Only 3

  4. 1 and 2

  5. 1, 2 and 3
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Many enzymes vital to life contain iron, such as catalase, lipoxygenases, and IRE-BP. Hemoglobin is an iron-containing oxygen-transport metalloprotein which transports O2 from the lungs to the tissues. Myoglobin, an iron-containing protein in muscle, receives oxygen from the red blood cells and transports it to the mitochondria of muscle cells. Many enzymes vital to life contain iron, such as catalase, lipoxygenases, and IRE-BP.

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