It's common after heart surgery to be sad or blue, but these feelings should pass after the first few weeks. If they don't, talk to your doctor about it. To keep your spirits up: Get dressed every day. Walk daily. Pick up your hobbies and social activities. Share your feelings with others. Get a good night's sleep. Limit visits to 15 minutes at first.
Eukaryotes. Eukaryotes are organisms made up of cells that possess a membrane-bound nucleus (that holds genetic material) as well as membrane-bound organelles. Genetic material in eukaryotes is contained within a nucleus within the cell and DNA is organized into chromosomes.
The DNA in eukaryotes, which are wrapped around histone proteins, are called nucleosomes. The DNA in eukaryotes is linear, and nucleosomes fold through a series of successively higher order structures to eventually form a chromosome. The DNA in prokaryotes, which form a mass, are called a nucleoid. Most DNA in prokaryotes is circular, and they are supercoiled to keep them gathered together.