The Structure of DNA (The Double Helix) DNA is made up of six smaller molecules -- a five carbon sugar called deoxyribose, a phosphate molecule and four different nitrogenous bases (adenine, thymine, cytosine and guanine).
(June 2012) (Learn how and when to remove this template message) Quarter marathon (QM) refers to either an exact race of a quarter of a marathon, or running for 10â15 kilometers (approx. 6.5â9 miles) without a rest. The former is held in many places around the world. Sisaket, a north-eastern province in Thailand, holds quarter marathons on the third Sunday of December every year.
If this is something you did before you were a runner, then now's a good time to stop that habit. A marathon, by definition, is a 26.2 mile race. So only races that are 26.2 miles should be called marathons. A half marathon race is 13.1 miles. Other races are also named by their distances, such as a 5K race (3.1 miles) and a 10K race (6.2 miles).