Lec4 - Cell Theory Every organism is composed of one or...

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Unformatted text preview: Cell Theory Every organism is composed of one or more cells. The cell is the smallest unit having the properties of life. All cells come from pre-existing cells. Robert Hooke in 1665 examined ery thin slices of cork and saw a The first to witness a live cell under a microscope was ntonie an Leeuwenhoek who in 1674 described the very thin slices of cork and saw a multitude of tiny pores that he remarked looked like the walled compartments (cells) a monk would live in. Antonie van Leeuwenhoek , who in 1674 described the algae Spirogyra . In 1839, Schwann and Schleiden suggested that cells were the basic unit of life. In 1855, Rudolf Virchow concluded that all cells come from pre- existing cells There Are Two Basic Types of Cells All cells have: Plasma membrane • Outer covering of all cells DNA • Contains the genetic instructions Cytoplasm • Region between the plasma membrane and the DNA • Contains cytosol Prokaryotic cell • Bacteria y • DNA is not enclosed in a nucleus Eukaryotic cell • All other cells • Organelles , e.g., nucleus ‘before’ nucleus ‘true’ nucleus From its size and shape to the structure of its parts, a cell is built to carry out life functions efficiently. 3 – 300 m Human Embryonic tem Stem Cells… Differentiate Into Nerve cells 3.2 The Parts of a Eukaryotic Cell The interior of a cell is divided into organelles, each with one or more special functions....
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This note was uploaded on 03/12/2012 for the course NPB 10 taught by Professor Moglinger during the Spring '12 term at UC Davis.

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Lec4 - Cell Theory Every organism is composed of one or...

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