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Question
Which element is normally absent in proteins?
Which element is normally absent in proteins?
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Solution
The correct option is D P
Proteins are polymers of amino acids. Proteins are formed when several amino acids are joined together by peptide bonds. Amino acids are compounds made up of carbon, hydrogen, nitrogen and oxygen. Amino acids contain two functional groups the carboxylic group and the amino group. Some amino acids like methionine and cysteine contain sulphur in addition to carbon, hydrogen, nitrogen and oxygen. Phosphorous is generally absent from the primary structure of proteins. Some conjugate proteins like phosphoproteins may, however, contain phosphorous but not as a primary constituent of proteins.Thus, the correct answer is option D.
Proteins are polymers of amino acids. Proteins are formed when several amino acids are joined together by peptide bonds. Amino acids are compounds made up of carbon, hydrogen, nitrogen and oxygen. Amino acids contain two functional groups the carboxylic group and the amino group. Some amino acids like methionine and cysteine contain sulphur in addition to carbon, hydrogen, nitrogen and oxygen. Phosphorous is generally absent from the primary structure of proteins. Some conjugate proteins like phosphoproteins may, however, contain phosphorous but not as a primary constituent of proteins.
Thus, the correct answer is option D.
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