Multiple choice Thioether group is present in which of following amino acids? Methionine Asparagine Lysine Tyrosine Reveal answer Fill a bubble to check yourself A Correct answer Explanation Methionine contains a thioether group (-CH2-CH2-S-CH3) in its side chain, where a sulfur atom is bonded between two carbon atoms. This is a distinctive structural feature of methionine among the amino acids.