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.
Half marathon. A half marathon is a road running event of 21.0975 kilometres (13.1094 mi) â half the distance of a marathon. Participation in half marathons has grown steadily since 2003, partly due to the fact that it is a challenging distance, but does not require the same level of training that a marathon does.