DNA Molecules

DNA Molecules

The building blocks of nucleic acids (nucleotide) each contain a Scarbon sugar (ribose or deoxyribose). a phosphate group and one of several organic bases. These nucleotidesarc joined so that the sugar.

DNA Structure 

And phosphate portions form a long chain, or backbone In a DNA molecule the organic bases stick out from this backbone and are bonded weakly to those of the second strand. The resulting structure is something like a ladder in which the uprights represent the sugar and phosphate backbones of the 2 strands, and the crossbars represent the organic bases In addition, the molecular ladder is twisted to form a double helix. The organic base of a DNA nucleotide can be one of four kinds tuleniiie (A), thymine (T). Therefore, there are only four kinds of DNA nucleotides:

1. Adenine nucleotide. 
2. Thymine nucleotide.
3. Cytosine.
4. Nucleotide.

Guanine Nucleotide

A strand of DNA consists of nucleotides arranged in a particular sequence. Moreover the nucleotide of one strand arc paired in a special way with those of the other strand only certain organic bases have the molecular shapes needed to fit together so that their nucleotide can bond with one another Specifically . an adenine will bond only to a thymine, and a cytosine will bond only to a guanine As a consequence of such base pairing, a DNA strand possessing the base sequence T. C. A. G would have to be bonded to a second strand with the complementary base sequence A. C. T C. It is the particular sequence of base pairs that encodes the genetic information held in a DNA molecule.