Multiple choice

Iron is an extremely important transition metal in biology. It helps in performing many different 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, 2 and 3

  5. 1 and 2
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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

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