The Citric Acid CycleThe reductive citric acid cycle behaves like a chemical hurricane. Carbon atoms from CO 2 (yellow and orange) attach at either end of molecules. As the cycle proceeds (counterclockwise), they are drawn toward the interior (red) until the molecule splits at the top of the cycle, creating two smaller molecules (curved arrow), which then repeat the cycle. var FO = { movie:"http://images.the-scientist.com/content/images/articles/54716/infographic

Before Darwin © Michele David, Lava Pool, 2001 How the earth went from lifeless to life. By Eric SmithUnderpainting by Michele Smith Illustrations by Bryan Satalino Related Articles 1 in 1865 that traits do not mix like paint when they are handed down from parents to offspring, but rather are shuffled like cards. The concept of the unmixable source of a trait (say, whether peas would be smooth or wrinkled) was given the name gene, and Mendel's im