Ch05 Key Concepts, Vocabulary-Cells The Working Units of Life

Ch05 Key Concepts, Vocabulary-Cells The Working Units of Life

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Chapter 5: Cells: The Working Units of Life OVERVIEW Chapter 5 examines the structure and function of both prokaryotic and eukaryotic cells. The chapter opens with brief discussions of cell theory, limits to cell size and homeostasis. This is followed by an introduction to light and electron microscopy and their applications to cell biology. Structural features of prokaryotic cells are presented including shared features and more specialized organelles. The largest section of the chapter is devoted to describing the organelles of eukaryotic cells, including the nucleus, the endomembrane system, ribosomes and mitochondria. The three components of the cytoskeleton are explained in the context of both structural and motor functions. Chapter 5 concludes with discussions of extracellular structures and endosymbiosis. KEY CONCEPTS 1. The cell is the basic unit of life. All cells come from preexisting cells and have certain processes, types of molecules, and structures in common. 2. Cells may have originated from “protocells”— cell-like structures thought to be similar to structures that can be produced in the laboratory. 3. To maintain adequate exchanges with its environment, a cell’s surface area must be large compared with its volume. 4. Microscopes are needed to visualize cells. Because of their greater resolving power, electron microscopes allow observation of greater detail than can be seen with light microscopes, while light microscopes provide a window into living cells. 5. Prokaryotic cell organization is characteristic of the domains Bacteria and
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This note was uploaded on 11/11/2011 for the course BIOL 101 taught by Professor Staff during the Spring '10 term at Howard.

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Ch05 Key Concepts, Vocabulary-Cells The Working Units of Life

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