One atom of this element can be replaced by a Selenium atom in cysteine, and it is found in ores such as pyrite and galena.
One compound in which this element is double bonded to oxygen is used to break G-C rich regions in PCR. It's not phosphorous, but this element is found in a set of ylides used in the Johnson-Corey-Chaikovsky reaction. One atom of it is complexed with iron in ferredoxin, and it is extracted in a process wherein superheated steam is passed underground, after which compressed air is used to lift the molten element upward. One atom of this element can be replaced by a Selenium atom in cysteine, and it is found in ores such as pyrite and galena. For 10 points, identify this element which can be extracted by the Frasch process, symbolized S.
One compound in which this element is double bonded to oxygen is used to break G-C rich regions in PCR.
{sulfur} [accept {S} before mentioned; accept {Sulphur}]