Lecture Slides 9_10 - 9_17

Lecture Slides 9_10 - 9_17 - 5 Cell Structure/Function...

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5. Cell Structure/Function Reading assignment: Chapter 6, pages 94 - 124. Historical perspective Cells have existed for an estimated 3.5 billion years 1665: Cell concept first proposed by Robert Hooke 1838: Schleiden & Schwann’s Cell Doctrine 1950’s: Electron microscope emerged; study of cells revolutionized. Methods to study cells Unaided eye: Not particularly useful since typical animal cells are about 5 times too small for us to see. Light Microscope: Became useful in the late 19th century and remains basic to cell study. Electron Microscope: Used to reveal cell ultra structure. Confocal Microscope: Relatively new laser light technology (1980’s). Size of cells Units of measure: Metric system base unit of length is the meter Orders of magnitude: Meter, millimeter, micrometer, nanometer Typical animal cell: 10–20 µm in diameter Typical bacterium: 0.5 µm in diameter Basic characteristics of cells Compartmentalization (outer membrane) Acquire, utilize and store energy (ATP) and other necessities (metabolic disequilibrium) DNA-facilitated replication Ultimate goal: Create and preserve order amongst chaos. Plasma (cell) membrane structure The lipid bilayer: Phospholipids Hydrophobic/hydrophilic Protein components Eukaryotic cell structures and organelles Cytomembrane system (cyto = cell) Endoplasmic reticulum Golgi complex (or bodies) Vesicles Metabolic Centers
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