Deoxyribonucleic acid (DNA) is a nucleic acid composed of long polynucleotide chains made up of four types of nucleotide subunits viz: Adenine (A), Guanine (G), Cytosine (C), and Thymine (T). Each of these chains is known as a DNA strand.
Hydrogen bonds between the base portions of the nucleotide subunits hold the chains together to form a double-helical structure that the DNA is found. The holding together of these bases in the DNA molecule follows the COMPLEMENTARY BASE PAIRING RULE, which states that an Adenine base always hydrogen bond with Thymine base (A-T) and Guanine base always hydrogen bonds with Cytosine base (G-C).
Based on this principle, in a DNA molecule with one of the strands called a template strand has sequence: TTGCACG, the complementary base sequence of this sequence on the template strand will be AACGTGC
The Miller–Urey experiment (or Miller experiment) was a chemical experiment that simulated the conditions thought at the time to be present on the early Earth, and tested the chemical origin of life under those conditions. The experiment supported Alexander Oparin's and J. B. S.
