The linkage present in proteins and peptides is

Options

A. `-oversetoversetO(||)C-NH-`
B. `-oversetoversetO(||)C-O`
C. `-oversetoverset(O)(||)C-O-oversetoverset(O)(||)C-`
D. `-NH-`

Answer

A

Explanation

Peptides are the amides formed by interaction between amino groups and carboxylic groups of two or more `alpha`-amino acids, e.g.
`underset"Glycine"(NH_2-CH_2-oversetoverset(O)(||)C-OH)+underset"Glycine"(H-NH-CH_2-oversetoversetO(||)C-OH) to underset(-H_2O)to underset"Peptide"(NH_2-CH_2-oversetoverset(O)(||)C-NH-CH_2-oversetoverset(O)(||)C-OH)`
Proteins are obtained by condensation polymerisation of `alpha`-amino acids through the formation of peptide bonds. Actually proteins are polypeptides with high molecular weight usually more than 10,000 u. Thus, the linkage present in proteins and peptides is `-oversetoverset(O)(||)C-NH-`