Double your dating wikipedia
Although each individual nucleotide repeating unit is very small, DNA polymers can be very large molecules containing millions to hundreds of millions of nucleotides.For instance, the DNA in the largest human chromosome, chromosome number 1, consists of approximately 220 million base pairs These two long strands entwine like vines, in the shape of a double helix.
The complementary nitrogenous bases are divided into two groups, pyrimidines and purines.
DNA) is a molecule that carries the genetic instructions used in the growth, development, functioning and reproduction of all known living organisms and many viruses.
DNA and ribonucleic acid (RNA) are nucleic acids; alongside proteins, lipids and complex carbohydrates (polysaccharides), they are one of the four major types of macromolecules that are essential for all known forms of life.
Each nucleotide is composed of one of four nitrogen-containing nucleobases (cytosine [C], guanine [G], adenine [A] or thymine [T]), a sugar called deoxyribose, and a phosphate group.
The nucleotides are joined to one another in a chain by covalent bonds between the sugar of one nucleotide and the phosphate of the next, resulting in an alternating sugar-phosphate backbone.
In a double helix, the direction of the nucleotides in one strand is opposite to their direction in the other strand: the strands are antiparallel.