Question

The peptide linkage is:
A. Amide
B. Ether
C. Ester
D. Anhydride

Answer 1

The peptide bond is formed between two amino acids by the joining of the carboxyl group of one amino acid with the amino group of another amino acid. The peptide linkage is represented by CO-NH.

Complete step by step answer:
A peptide is a short polymer formed by the amino acid monomers which is linked by an amide bond. A peptide bond is a chemical bond which is formed by the joining of a carboxyl group of one amino acid with the amino group present in the other compound. A peptide bond is a covalent chemical bond which is formed by the sharing of electrons (CO-NH). In the formation of bonds, water molecules are released. As water molecules are released during the bond formation therefore, the process is referred to as dehydration.
During the formation of bonds, the two amino groups are linked together by eliminating water and forming peptide bonds.
During this reaction, one out of two amino acids gives carboxyl group and releases hydroxyl group. The other amino acid lost the hydrogen from the amino group. The hydroxyl group is replaced by the nitrogen and as a result peptide bond is formed. The new amino acid formed is known as dipeptide.
Thus, the peptide linkage is amide.
Therefore, the correct option is A.

Note:
The peptide bond has a strong partial double bond character. They are planar in nature and stabilize the protein structure. Depending on the number of amino acids present the peptide bond can be named according to that. For example dipeptide, tripeptide.