An example of a sulphur containing amino acid is:A.lysineB.serineC.cysteineD.tyrosine

The question asks for an example of a sulfur-containing amino acid from the options given. Let’s analyze each option:

A. Lysine: This is an essential amino acid that contains nitrogen but no sulfur.

B. Serine: This is a polar amino acid that contains hydroxyl (–OH) but does not contain sulfur.

C. Cysteine: This is a sulfur-containing amino acid. It contains a thiol group (–SH) in its side chain, which is responsible for its sulfur content.

D. Tyrosine: This amino acid contains a phenolic hydroxyl group but does not contain sulfur.

Conclusion: The correct answer is C. cysteine, as it is the only amino acid in the list that contains sulfur in its structure.