Question

In a dinucleotide, number of ester bond is
A. 1
B. 2
C. 3
D. 4

Answer 1

Hint: When an ester bond is present between the two nucleotides is called dinucleotide. Nucleotides are organic compounds with heterocyclic rings. A nucleotide consists of a nitrogen base, a pentose sugar, and a phosphate group. Bonds which are formed from carbon and oxygen like a single bond to carbon and double bond to oxygen are called esters bonds.

Complete answer:
-Monomeric units of nucleic acids are known nucleotides. Nucleotides are phosphate esters of nucleotides and are made up of three components – a base that has a nitrogen atom, a five-carbon sugar, an ion of phosphoric acid. A nucleotide has three chemically distinct components. One is a heterocyclic compound; the second compound is a monosaccharide, and the third a phosphoric acid. Example: Nicotinamide adenine dinucleotide (NAD)
-When an ester bond is present between the three nucleotides is called trinucleotide. Trinucleotide is present in the gene code.
-When an ester bond is present between the four nucleotides is called tetranucleotide. Tetranucleotide is a sequence of 4 base pairs.
-When an ester bond is present between the five nucleotides is called pentanucleotide. Pentanucleotide is a sequence of 5 base pairs.
So, the correct answer is “Option A”.

Note:
The macromolecule type that is present in the acid-insoluble fraction of any living tissue is the nucleic acid. Polynucleotide together known as polypeptides and polysaccharides comprise the true Marco molecular fraction of any living tissue or cell. Nucleic acids are the building blocks of a nucleotide. Amino acids and the carboxyl group are linked by a peptide bond in the polysaccharide.