Cell biology is the study of cell structure and function, from the most general properties shared by all cells, to the unique, highly intricate functions particular to specialized cells.
There are several main subfields within cell biology. One is the study of cell energy and the biochemical mechanisms that support cell metabolism. Another subfield of cell biology focuses on the structure of cell components, known as subcellular compartments, or organelles. In addition, a subfield of cell biology concerned with the cell cycle, the progression of phases beginning and ending with cell division and focused on different periods of growth and DNA replication. And finally, there is the subfield primarily concerns the mechanisms triggers cell death, including apoptosis, necrosis, and autophagy. Combining different field of cell biology allows scientists to analyze cellular behaviors in more complex ways.