Question

Bond present between two nucleotides of a polynucleotide is
A. Covalent bond
B. Hydrogen bond
C. Phosphodiester bond
D. High energy phosphate bond

Answer 1

A nucleotide is a key for the formation of DNA and RNA. A nucleotide consists of a five-carbon sugar, a phosphate group and the nitrogen base. They are responsible for the metabolism and energy in the form of ATP and GTP.

Complete answer:
Covalent bond. It involves sharing of the electrons whereas is the formation of the bond between the two nucleotides the sharing, as well as the removal of the water molecule, is observed. The bond partially a be considered as the covalent bond but not completely
So, option A is not correct
Hydrogen bond: it is the bond between the hydrogen and the electron-rich atom. It is considered as the weak bond, so it cannot form a bridge between two nucleotides which forms a long polynucleotide chain
So, option B is correct
Phosphodiester bond: It acts as the connection between two nucleotides or adjacent nucleotides in the DNA strand. A nucleotide with a hydroxyl group three-position and phosphate on the fifth position of another nucleotide links together by removing oh group forming a complete ester bond including the phosphate hence, it is phosphodiester bond is seen between two nucleotides in a polynucleotide chain.
So, option C is correct
High energy phosphate bond is mostly seen in Atom and GTP which acts as energy sources, not in nucleotides
So, option D is false
So, the correct answer is “Option C”.

Note:
Phosphodiester bonds are the backbones in the nucleic acids as the linkage helps in the formation of the long strands. It is a bond between sugar and phosphate groups; it is a condensation reaction with the removal of a water molecule. In the DNA or RNA strands, they form a continuous chain by attaching with the help of bonds and these bonds act as bridges between the adjacent nucleotides forming a complete strand