Dna Diagram Nitogenou Base. Purines The most commonly occurring pyrimidines in DNA are cytosine and thymine. The basic unit of structure for a DNA molecule is the nucleotide.
Note the difference in groove width and the relative displacements of the base pairs from the central axis. In DNA Adenine A always pairs with thymine T and guanine G always pairs with cytosine C. Difference between gene and DNA.
A Structures of A-DNA and B-DNA.
It was found through the X-ray diffraction technique that one turn of helix measure around 34 Angstrom units 1 Angstrom 10-10 or 34 nm. DNA deoxyribonucleic acid and RNA ribonucleic acid are composed of two different classes of nitrogen-containing bases. It is inherited from the mother to the child. These four carbon atoms and one oxygen atom are arranged in a structure that in a schematic representation offers a pentagon-like appearance.
