00:01
In this answer we are going to select an option which refers to the type of bond which links the nucleotides and the nitrogenous bases in a dna molecule.
00:15
So a nucleotide consists of three components namely a sugar, a phosphate group and a nitrogenous base.
00:28
So in this case we are referring to dna.
00:31
So the sugar present in dna is deoxy ribose and the nitrogenous basis present in dna are adenine, thymen, guanine and cytosine.
00:46
The nucleotides are linked together by the phosphodiaster bonds which are formed between the 3 prime hydroxyl group of the sugar of the first nucleotide and the 5 prime phosphate group of the sugar in the second nucleotide.
01:05
The formation of phosphoryester bonds results in the elongation of the dna strand during the process of dna replication.
01:14
The basis which exists between the two strands of dna are connected by the complementary base pairing where the adenine present in one strand bonds with the time in present in the second strand and guanine which is present in one strand complemently base pairs with the cytosin which is present in the second strand.
01:37
This complementary base pairing takes place via the hydrogen bonds which are formed between the hydrogen atom and an electro -negative atom.
01:50
So adenine and tymen are linked by two hydrogen bonds while gwonen and cytosin are linked by three hydrogen bonds.
01:57
Option a which says the nucleotides are linked by the ionic bonds and the bases are linked by the hydrogen bonds is the wrong option because the nucleotides are linked by the phosphor diester bonds while ionic bonds are formed by the attraction between two oppositely charged ions...