Sulphur is an essential component of:__________?
Correct answer: D. All of these
- A. Cystine
- B. Cystein
- C. Methionine
- D. All of these
Explanation
Sulphur occurs in the amino acids cystine, cysteine and methionine; cystine contains a disulphide bond formed from two cysteine molecules. Thus all three listed compounds contain sulphur.
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