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Deoxyribonucleic acid (i/diˌɒksiˌraɪboʊ.njuːˌkleɪ.ᵻk 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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The Birth of Venus (Italian: Nascita di Venere [ˈnaʃʃita di ˈvɛːnere]) is a painting by Sandro Botticelli generally thought to have been painted in the mid 1480s. It has long been suggested that Botticelli was commissioned to paint the work by the Medici family of Florence, specifically Lorenzo di Pierfrancesco de' Medici under the influence of his cousin Lorenzo de' Medici, close patron to Botticelli. However, there are no documents associated with the painting, and its first identification with the Medici family only comes in the 1550 edition of Vasari's Lives. It depicts the goddess Venus, having emerged from the sea as an adult woman, arriving at the shore (which is related to the Venus Anadyomene motif). The painting is on display at the Uffizi Gallery in Florence, Italy. (Full article...)
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