The four nitrogenous bases that make up the DNA structure are divided into two groups, called purines and pyrimidines. Adenine and guanine are purines, and chemically are double-ringed structures - a five cornered ring and a six cornered ring. They are much larger than pyrimidines.
James Mason (I) (1909â1984) James Mason was a great English actor of British and American films. He was born in Yorkshire, and attended Marlborough and Cambridge, where he discovered acting on a lark, and abandoned a planned career as an architect. Following work in stock companies, he joined the Old Vic under the guidance of Sir Tyrone Guthrie and of Alexander Korda, who ...
US Presidents Freemasons There have been fourteen U.S. Presidents who were Freemasons, beginning with George Washington who was a Virginia Mason, as were James Monroe, and William McKinley. 1 George Washington (Virginia Mason) 1st President, 1789 â 1797, Commanding General during American Revolution, made a Mason August 4, 1753, in Fredericksburg Lodge (now No. 4), A.F. & A.M., Fredericksburg, Virginia.