The sulfur group in cysteine arises from the same source in plants, animals and bacteria.
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Q20: The nitrogen-fixing enzyme system, nitrogenase, is found
Q21: Some amino acids can only be made
Q22: Which of the following is not an
Q23: The carbon skeleton used to make serine
Q24: A metabolic intermediate that is not a
Q26: There is a curious diversity of nature
Q27: In animals, the synthesis of cysteine involves
Q28: Which of the following are all essential
Q29: The serine family of amino acids includes
Q30: By a simple transamination reaction, intermediates in
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