Question

Bond between phosphate and sugar in a nucleotide is
A) Hydrogen bond
B) Covalent bond
C) Phosphodiester bond
D) Sulphide bond

Answer 1

Hint: Nucleotides are the building blocks of nucleic acids like deoxyribonucleic acid and ribonucleic acid. Nucleotide consists of a sugar molecule, a nitrogen base and phosphate group. The bond involved in the attachment of the sugar molecule and phosphate group is a covalent bond.

Complete answer:
Molecules form large or complex molecules attached through bonding. The nucleotide is a giant molecule consisting of three main parts. These three parts are sugar molecules, a nitrogen base and a phosphate group. The nitrogen base are the molecules like adenine. The sugar molecules are involved in cyclic form.
These nucleotides are the building blocks of nucleic acids. The nucleic acids include deoxyribonucleic acid and ribonucleic acid. Deoxyribonucleic acid is generally known as DNA and ribonucleic acid is generally known as RNA.
There are four different types of nucleotides based upon the nitrogenous base. These are adenine, thymine, guanine and cytosine.
The sugar molecule and phosphate group in nucleotides is attached through a chemical bonding. The chemical bond involved is covalent bond.
Thus, option B is the correct one.

Note:
Covalent bond is the strongest chemical bond. It can be formed by the sharing of one electron from each group or atom leads to its higher stability. It is stronger than other chemical bonds like ionic bond, hydrogen bond and coordinate covalent bond or dative bond. High amount of energy is required to break this bond.