what-makes-l-cysteine-an-exception-to-the-rule-that-all-l-amino-acids-have-an-s-

Question

What makes L Cysteine an exception to the rule that all L amino acids have an S configuration?

Accepted Answer

Its R group has a higher priority than the carboxyl group.

Answer

It is the only amino acid with a sulfur atom.

Answer

It has a unique hydrogen bonding pattern.

Answer

It forms disulfide bonds.