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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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The Last Judgement by Michelangelo di Lodovico Buonarroti Simoni
Shortly before his death in 1534 Pope Clement VII commissioned Michelangelo to paint a fresco of The Last Judgement on the altar wall of the Sistine Chapel. His successor, Paul III was instrumental in seeing that Michelangelo began and completed the project. Michelangelo labored on the project from 1534 to October 1541. The fresco depicts the Second Coming of Christ and his Judgement of the souls. Michelangelo ignored the usual artistic conventions in portraying Jesus, and showed him a massive, muscular figure, youthful, beardless and naked. He is surrounded by saints, among which Saint Bartholomew holds a drooping flayed skin, bearing the likeness of Michelangelo. The dead rise from their graves, to be consigned either to Heaven or to Hell. (Full article...)

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