Sulfhydryl

... used for remediation of heavy metals. In such cases, they take it up with other ions in water and store them bound to proteins containing lot of sulfhydryl groups. After growing they are burned and the metals taken from the ash.

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http://en.wikipedia.org/wiki/Disulfide_bond so i would say e. sulfhydryl

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... following functional groups forms cross bridges that help stabilize protein tertiary structures? a. hydroxyl b. carbonyl c. amino d. phosphate e. sulfhydryl

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Sulfhydryl. I think it's an inhibitor site...

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