Copy of Intro to Cells and Cell Membrane

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Introduction to Cells and Cell Membrane Lecture Cell Discovery and Theory Microscopes led to discoveries of cell theory 1590 – first microscope 1665 – Robert Hooke observes cells in cork 1683 – protozoans discovered As microscopes improve can see more detail, and learn more about cells Cell Theory 1. All living organisms are composed of 1 or more cells 2. Cells are the basic unit of structure and organization of all living organisms 3. Cells arise only from previously , with cells passing copies of their genetic material on to their daughter cells Prokaryotic vs. Eukaryotic cells _____________ simple, no nucleus or organelles ex. – most bacteria _____________more complex, nucleus and other organelles ex. – animal and plant cells, also algae and yeast and protozoa (amoeba) Cell Membrane Cell membrane is a ________________ bilayer. Function of cell membrane: ____________ barrier Regulate transport __________ of cell (selectively permeable) Allow cell recognition Provide anchoring sites for ____________________________ Provide a binding site for ________________
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