Ch 4-Cell Organization

Ch 4-Cell Organization - Ch 4 CELL ORGANIZATION Cell Theory...

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Ch. 4 - CELL ORGANIZATION Cell Theory Size/Shape Microscopes Prokaryotic or Eukaryotic Structure s Cell Theory Hooke (1665) -first microscope and used name cell Leeuwenhoek (1632-1723)- lens grinder-father of microbiology -records Schleiden (1838) plant cells- botanist Schwann (1839) animal cells- zoologist Virchow (1855) all cells from cells- no spontaneous generation 1 - all organisms are composed of cells 2 - cells are the smallest living things 3 - cells arise only from preexisting cells -no spontaneous gen. Cell Size and shape -cells are limited in size by the surface to volume ratio -volume increases faster than surface-soon have more volume than surface can take care of --surface must exchange all nutrients and wastes -diameter of most is 10-30 µm (microns = a millionth of a meter) µm = micrometer (micron) = 10 -6 meter = a millionth log arithmic scale (big changes) meter decameter centimeter millimeter micrometer nanometer 10 100 1000 1,000,000 1,000,000,000 -some are very large - chicken egg - most of it is food reserves - functional part is small disc on top - different shapes depends on function (nerve cells 3+ feet long conduction, intestinal cells villi increase surface) -in human body, more than 100 different cell types and a total of 100 trillion cells Microscopes light microscope (1665) --passes light through thin specimen, 1000 x + - our lab microscopes are 430 x TEM - transmission electron microscope (1934)-- passes beam of electrons through thin specimen 300,000+ x SEM - scanning electron microscope-- beam of electrons scans the surface of a specimen shows great depth of field -shows the bumps and valleys of the surface specimen is coated with gold and is NOT sliced but is 3 dimensional Cells are Prokaryotic (before nucleus) or Eukaryotic (true nucleus) P -cell wall composed of different molecules than Eukaryotic cell walls -no membrane-bound organelles --no nucleus, mitochondria, chloroplast etc. -bacteria -Eubacteria, Archaeobacteria--sometimes called Monera or Prokaryotae
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This note was uploaded on 02/07/2011 for the course BIO 1110 taught by Professor Mcdearman during the Spring '11 term at UT Chattanooga.

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Ch 4-Cell Organization - Ch 4 CELL ORGANIZATION Cell Theory...

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