Topics:
Animal Nutrition, Animal Refresher
Sulphur and Selenium Containing Biomolecules
Which of the following pairs is/are correctly matched?
(a) Sulphur-containing vitamins: Thiamine & Biotin
(b) Sulphur-containing amino acids: Cysteine & Methionine
(c) Selenium-containing enzyme: Glutathione peroxidase
- Only (a) and (b)
- Only (b) and (c)
- All the above — (a), (b) and (c) — Correct Answer
- Only (c)
Explanation:
Correct Answer: All the above
All three pairs are correctly matched:
- Sulphur-containing vitamins: Thiamine (B1) — contains a thiazole ring with sulphur; Biotin (B8) — contains a tetrahydrothiophene ring with sulphur.
- Sulphur-containing amino acids: Cysteine (–SH thiol group) and Methionine (–S–CH₃ thioether group). Also include homocysteine and taurine.
- Selenium-containing enzyme: Glutathione peroxidase — contains selenocysteine at its active site. It neutralises hydrogen peroxide and lipid hydroperoxides, protecting cell membranes.
Key Metalloenzymes to Remember
- Copper → Cytochrome oxidase, Uricase, Ceruloplasmin
- Zinc → Carbonic anhydrase, Alcohol dehydrogenase, Alkaline phosphatase
- Selenium → Glutathione peroxidase
Additional Sulphur Facts
Wool contains 4% sulphur; human hair keratin contains 14% sulphur. Sulphur-containing hormones: Insulin, ADH/Vasopressin, Oxytocin.
📚 About this Topic — Animal Nutrition
This multiple choice question is from Animal Nutrition, Animal Refresher. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Nutrition to strengthen your preparation.
