Q.

Which one of the following hormones contains iodine?

A. Thyroxine
B. Testosterone
C. Insulin
D. Adrenaline
Answer» A. Thyroxine
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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