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10cells - Lecture 10 Cell Structure and Function Chapter 3...

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Lecture 10: Cell Structure and Function Chapter 3: Evolution of the Nucleus
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The Big Picture Cell Theory Evolutionary History of the Eukaryotic Cell The Nucleus and Endomembrane System
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Who Would Have Thought? All organisms are composed of cells From humans to the tiniest unicellular bacteria Cell theory not postulated until 17 th century Invention of the microscope
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Size Comparison Most cells can only be viewed under a microscope Eukaryotic cells are about 100 micrometers (100 μm) in diameter Less than the width of a human hair!
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Size and Scale http://learn.genetics.utah.edu/content/begin/cells/scale /
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Concept #1 1.) All living things are made up of cells Bacteria are an obvious example : 1 cell = 1 organism Is there any organ in the human body not composed of cells?
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Bone Tissue Sample Even hard, dense bones are made up of cells You have to look under a microscope!
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Cells Look Different Different sizes, shapes, and other external appearances help each cell serve a different function But they all have certain aspects in common
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Concept #2 2.) A cell is the basic functional unit of life Nothing smaller than a cell is alive E.g. molecules, atoms, subatomic particles cannot exhibit any of the 7 characteristics of life
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Concept #3 3.) New cells arise only from pre-existing cells Scientists debunked the theory of spontaneous generation in the 19 th century
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