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The three main parts of a cell are the plasma membrane, the region containing the DNA and the cytoplasm. However, not all cells have exactly the same basic parts. There is a difference between the structures of eukaryotic and prokaryotic cells.


There are five main types of computers: mainframes, supercomputers, minicomputers, professional workstations and microcomputers. Computers come in various sizes and have different capabilities. A computer can be as small as a microcontroller found in a mobile phone and embedded systems, or large eno


Some of the main functions of skin cells are to provide protection, perceive and transmit sensation, control evaporation and regulate temperature. Skin cells, which are epithelial cells, are also self-repairing and reproduce quickly. Epithelial cells are the most commonly found of the four tissue ty


The main function of muscle cells is to produce contractions of the muscle. Impulses are sent through the nervous system along the muscle cells and cause the muscle to contract.


The four main personality types, or temperaments, are sanguine, choleric, melancholic and phlegmatic. Choleric and sanguine personalities are typically more extroverted and outgoing, while melancholic and phlegmatic personalities are introverted and reserved.


Animal cells are eukaryotic cells, or cells that contain a membrane-bound nucleus. The nucleus holds the DNA of the cell that provides the cell with instructions for life.


The main types of coupling include rigid sleeve, flanged, jaw and spider coupling. Rigid sleeve and flanged coupling are generally known as rigid coupling, while jaw and spider coupling fall under flexible coupling.


The six most popular types of home siding are vinyl, wood, brick, stucco, stone and fiber-cement. Each has its own benefits and downfalls.


The two main types of plastics are called thermosetting plastics and thermoplastics. Thermosetting plastics, once heated and cooled, cannot be reheated and remolded. Thermoplastics can be reheated and reshaped.


All rocks fall into the three main categories of igneous, metamorphic or sedimentary. These rocks vary widely in physical appearance and location and their formation patterns differ, as well: igneous rocks form cooling magma deep within the earth's core. Activity within the core produces metamorphic