question_answer

The main structural feature of protein is

A)  the ester linkage

B)  the ether linkage

C)  the peptide linkage

D)  All of the above

Correct Answer: C

Solution :

                 Proteins are complex nitrogeneous molecule which are essential for the growth and maintenance of life. Proteins are the constituents of cells and therefore, are present in all living bodies. The molecular masses of proteins are very high. Structurally proteins are long polymers of amino acid linked by peptide \[(-CO-\underset{\begin{smallmatrix}  | \\  H \end{smallmatrix}}{\mathop{N}}\,-)\] bonds.