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The nitrogenous bases of the two separate polynucleotide strands are bound together, according to base pairing rules (A with T and C with G), with hydrogen bonds to make double-stranded DNA.

The complementary nitrogenous base pairs are divided into two main groups, pyrimidines and purines.

Under the genetic code, these RNA strands are translated to specify the sequence of amino acids within proteins in a process called translation.

Within eukaryotic cells DNA is organized into long structures called chromosomes.

During cell division these chromosomes are duplicated in the process of DNA replication, providing each cell its own complete set of chromosomes.

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.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 nucleotide contains both a segment of the backbone of the molecule (which holds the chain together) and a nucleobase (which interacts with the other DNA strand in the helix).Most DNA molecules consist of two biopolymer strands coiled around each other to form a double helix.The two DNA strands are called polynucleotides since they are composed of simpler monomer units called nucleotides.

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(Photo by Jeff Spicer/Getty Images)The pair dated from 2012 to 2014 and it was believed Cressida was being seen as a potential wife, but the British socialite was uncomortable with life in the royal fishbowl and has since become a theatre actress.

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A short but clear explanation about radioactive isotopes commonly used for determining ages of rocks (with graphics) and putting numbers on the geologic time scale, extending it back before the occurance of abundant index fossils.

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