Answer:
The correct answer is option A.) "hydrogen and sulfur".
Explanation:
Sulfhydryl is a functional chemical group comprised of an atom of sulfur bonded to a hydrogen atom, which are usually attached to an organic molecule (R-SH). The sulfhydryl, also known as thiol, has an important role in chemistry for being the part of the cysteine residues that form the disulfide bonds within proteins. The disulfide bonds play an important role in establishing the higher order structure of proteins, which allows for their proper biological function.
