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DNA Structure+Key+Labelled.pn NoBB.png
Deoxyribonucleic acid (Listeni/diˌɒksiˌrb.njˌkl.k ˈæsɪd/; DNA) is a molecule that carries most of the genetic instructions used in the development, functioning and reproduction of all known living organisms and many viruses. DNA is a nucleic acid; alongside proteins and carbohydrates, nucleic acids compose the three major macromolecules essential for all known forms of life. Most DNA molecules consist of two biopolymer strands coiled around each other to form a double helix. The two DNA strands are known as polynucleotides since they are composed of simpler units called nucleotides. Each nucleotide is composed of a nitrogen-containing nucleobase—either cytosine (C), guanine (G), adenine (A), or thymine (T)—as well as a monosaccharide 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. According to base pairing rules (A with T, and C with G), hydrogen bonds bind the nitrogenous bases of the two separate polynucleotide strands (Full article...)

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Madonna with Child by Antonello da Messuba
The Madonna with Child (Salting Madonna) is a painting by the Italian Renaissance master Antonello da Messina, depicting the Madona holding the Child and wearing an ornate golden crown, held by angels over her head. It is housed in the National Gallery, London. The name Salting derives from George Salting, the collector who donated it to the gallery in 1910. (Full article...)

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