Tertiary structure is not directly dependent on tertiary structure is not directly dependent on bonds between sulfur atoms hydrophobic interactions hydrogen bonds ionic bonds peptide bonds

The answer is:

Peptides bonds

The explanation:

when:

Tertiary structure is achieved when a protein folds into a compact, three-dimensional shape stabilized by interactions between side-chain R groups of amino acids .  

-And  peptides are short chains of amino acid monomers linked by peptide (amide) bonds. The covalent chemical bonds are formed when the carboxyl group of one amino acid reacts with the amino group of another.

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.