Multiple choice Which of the following sets represents sulphur containing amino acids only? Cystine and Threonine Cysteine and Methionine Methionine and Lysine Lysine and threonine Reveal answer Fill a bubble to check yourself B Correct answer Explanation Cysteine (Chemical formula HO2CCH(NH2)CH2SH): Sulphur containing amino acid Methionine (Chemical formula HO2CCH(NH2)CH2CH2SCH3): Sulphur containing amino acid