Lecture1_08_Handouts

Lecture1_08_Handouts - Lecture 1 August 26, 2008...

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1 Lecture 1 – August 26, 2008 Introduction to Cells: Cells Under the Microscope Cells Under the Microscope; Procaryotic and Eucaryotic Cells ± All living things are made of cells ± Cells are the fundamental units of life Some introductory concepts ± Cell Biology studies cells’ structure and function Cells vary in size , shape , function Nerve cell Paramecium Section of a plant stem Bdellovibrio Macrophage (human white blood cell) approaching and engulfing a red blood cell 100 μm 25 μm 10 μm 0.5 μm
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2 However, all cells resemble one another In all living cells, genetic information flows from DNA to RNA and from RNA to proteins Invention of the light microscope in the 17 th century enabled scientists to visualize cells ± In 1665 , Robert Hooke reports that cork is composed of a mass of minute cells, which he called ‘cells’ ± In 1838 and 1839 , Matthias Schleiden and Theodor Schwann publish two papers in which they used the light microscope to systematically look at plant and animal tissues, showing that cells are the universal building blocks of all living organisms
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Lecture1_08_Handouts - Lecture 1 August 26, 2008...

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