A chromosome (chromo- + -some) is a packaged and organized structure containing most of the DNA of a living organism.ccurring only in the nucleus of eukaryotic cells, chromatin composes the vast majority of all DNA, except for a small amount inherited maternally which is found in mitochondria. In prokaryotic cells, chromatin occurs free-floating in cytoplasm, as these cells lack organelles and a defined nucleus.
Rolling in the Deep. Rolling in the Deep is a song recorded by British singer Adele for her second studio album, 21. It is the lead single and opening track on the album. The song was written by Adele and Paul Epworth. The singer herself describes it as a dark blues-y gospel disco tune.
Rolling in the Deep is the fourth song to top the Billboard Year-End Hot 100 singles chart and to win both Grammy Award for Record of the Year and Song of the Year in the same year, after  Bridge Over Troubled Water  by Simon & Garfunkel in 1970/1971, .