The double-disc collection Neil Sedaka Sings the Hits is a comprehensive chronicle of Sedaka's hit-making stint at RCA, from his first hit in 1958 (The Diary) to his last recordings for the label in the late '60s.
The nucleus is particularly important among eukaryotic organelles because it is the location of a cell's DNA. Two other critical organelles are mitochondria and chloroplasts, which play important roles in energy conversion and are thought to have their evolutionary origins as simple single-celled organisms.
Figure 4: Comparing basic eukaryotic and prokaryotic differences. A eukaryotic cell (left) has membrane-enclosed DNA, which forms a structure called the nucleus (located at center of the eukaryotic cell; note the purple DNA enclosed in the pink nucleus).