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 ...
George Mason IV was born December 11, 1725, on Dogue's Neck, Virginia (modern-day Fairfax County), the son of George Mason III and Ann Thomson Mason. When he was 10, Mason's father died.He was brought up in part by his uncle, John Mercer, who reportedly had a 1,500-volume library, which had an influential effect on Mason. A local landowner (and neighbor of George Washington), Mason began taking interest in local affairs at an early age.eorge Mason was an American patriot who participated in the American Revolution and the Constitutional Convention and who was influential in penning the Bill of Rights.