Question

Question #cbf34

Answer 1

`(C)` A peptide bond

Explanation:

Let's analyse each option one by one:

`(A)` Does `beta`-pleated sheet resemble glycosidic linkage?

No! `beta`-pleated sheet is one of the pattern of arrangement which is formed by folding back of polypeptide chains. So it doesn't seem to match the glycosidic linkage. It is one of two types of secondary structure of protein.

`(B)` Does disulphide Bond resemble glycosidic linkage?

No! Usually when polypeptide chains bends and folds extensively then these chains are held together by several bonds. One of these is disulfide bond. So it is not present b/w the amino acids but b/w the chains of these amino acids to maintain their globular shape(tertiary structure). While glycosidic linkage is present between carbohydrates monomers i.e monosaccharides.

`(C)` Does peptide Bond resemble glycosidic linkage?

Yes! Proteins are polymers made up of amino acids.(monomers). These amino acids link with each other through covalent bonds i.e peptide bonds to form polypeptide chains of proteins.
Carbohydrates are polymers made up of monosaccharides(monomers). These monosaccharides link with each through covalent bond i.e glycosidic bond or linkage. Thus, peptide bond is the one which is similar to glycosidic linkage in carbohydrates.

`(D)` Does an amino group resemble glycosidic linkage?

Amino group and glycosidic linkage are poles apart. Amino group i.e `NH^(3+)` is bonded to the alpha carbon of amino acid. The amino group of one amino acid reacts with the carboxyl group of another amino acid to form peptide bond b/w them. Thus, amono group itself is not any sort of bond or linkage.

Hope it helps!