Which of the following is true of protein structure Peptide

Which of the following is true of protein structure? Peptide bonds are formed by hydrolysis. Peptide bonds join the amine group on one amino acid with the R group of another amino acid. Secondary protein structures are caused by hydrogen bonding between adjacent amine and carboxyl groups. Tertiary protein structure emerges when there is more than one peptide chain in a protein.

Solution

Proteins are macromolecules formed by amino acid subunits. The amino acids form peptide bonds between the amino group nitrogen of one amino acid and the carboxyl oxygen of the adjacent amino acid. The peptide bond is a covalent chemical bond and series of amino acids joined by peptide bonds constitute polypeptides.

The proteins are classified as different hierarchical structures. The primary structure of proteins constitutes only a stretch of amino acids joined by peptide bonds. The secondary structure of proteins forms when different non-covalent bonds such as hydrogen bonds among the adjacent amine and carboxyl group causes the peptide chains to assume alpha helices or beta sheets. The tertiary structure of proteins is formed by forming the secondary polypeptide chain in a compact and feasible conformation. The quarternary structure forms when there is more than one polypeptide chain in a protein structure.

Thus, option (3) [or (C) ] is the correct option.