Question

Secondary structure of protein refers to:

• A. sequence of amino acids in polypeptide chain
• B. bonds between alternate polypetide chains
• C. folding patterns of polypeptide chain
• D. bonding between $N{H}_3^{+}$ and $CO{O}^{-}$ of two peptides

Answer 1

The correct option is C folding patterns of polypeptide chain

The primary structure of proteins is the covalent connections. It refers to the linear sequences, number and nature of amino acid. They are bonded by peptide bonds only. When there is folding in the linear polypeptide chain into the specific coiled structure, it is known as a secondary structure.
In the secondary structure, the hydrogen bonds are also formed. It stabilises the complex structure of the secondary structure of the protein. These are found in the keratin of hairs, feathers, and silk fibres. So, the correct answer is option (c).