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| Q. |
Which one of the following hormones contains iodine? |
| A. | Thyroxine |
| B. | Testosterone |
| C. | Insulin |
| D. | Adrenaline |
| Answer» A. Thyroxine | |
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Explanation: Thyroxine is produced by attaching iodine atoms to the ring structures of this protein's tyrosine residues; thyroxine (T4) contains four iodine atoms, while triiodothyronine (T3), otherwise identical to T4, has one less iodine atom per molecule. |
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