Question

Which element is normally absent in proteins?
(a) C (b) N
(c) S (d) P

Answer 1

Answer:

anseer is nitrogen. it is correct

Answer 2

The required "option d) P" is correct.

Explanation:

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 (C), hydrogen (H), nitrogen

(N) and oxygen(C). Amino acids having two functional groups:

The carboxylic group and

The amino group.

Some amino acids like methionine and cysteine contain sulphur in addition to carbon (C), hydrogen (H), nitrogen(H) and oxygen(O).

Phosphorous is generally absent from the primary structure of proteins.

Thus, the required "option d) P" is correct.