Question

The bond that determines the secondary structure of a protein is
A. Co-ordinate bond
B. Covalent bond
C. Hydrogen bond
D. Ionic bond.

Answer 1

Hint: To solve this question we have to know about the essential constituent of our body that is protein. Protein is a naturally occurring and extremely complex substance that consists of amino acid residues. Proteins are present in all living organisms.

Complete Step by Step Answer:
Protein is present as primary, secondary and tertiary structures.
Hydrogen bond determines the secondary structure of proteins. Depending on the nature of hydrogen bonding, two types of secondary structure are formed that are the \[\alpha \] - helix and the \[\beta \] - sheet.

The \[\alpha \] -helix is defined as a right-handed coiled strand. The side-chain of the amino acid groups in the \[\alpha \] -helix extends to the outside. Hydrogen bonds form between the oxygen atom of the peptide bond and the hydrogen atom of the $N-H$ group of the peptide bond.

The hydrogen bonding in the \[\beta \] -sheet is between strands. Ionic bond is present between ions. The covalent bond is formed by the sharing of electrons. The coordinate bond is formed due to sharing of electrons from one atom to another atom.
Thus the correct option is C.

Note: Hydrogen bond is a strong bond formed between hydrogen and an electronegative atom such as oxygen, nitrogen etc. The formation of hydrogen bonds makes a compound exceptionally stable.