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Important terms • Magnification: ratio of an object’s image size to its real size • Resolving power: minimum distance between two points at which they are still distinguishable as different objects (measure of clarity) • Working Distance: distance between specimen and lens (higher magnification = smaller working distance) • Field of View: area visible through the ocular • Depth of field: amount of vertical distance that is in focus Important relationship • Total magnification = ocular magnification X objective magnification • As magnification increases: Working distance decreases Field of View gets smaller of view decreases Depth Basic cell types Eukaryotic cell: Possess distinct organelles (Fungi, Plants, Animals) QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. Prokaryotic cell: Lack distinct organelles (Bacteria, Archaea) Animal Cell Plant Cell Elodea leaf QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. http://youtube.com/watch?v=8edk6nGMwMs Size of cells: Why aren’t cells bigger? Review Prokaryotes Eukaryotes • No nucleus • Membrane-bound nucleus • Circular DNA, not in chromosomes • Linear DNA in chromosomes • Unicellular • Unicellular or multicellular • No membrane-bound organelles • Membrane-bound organelles • Binary fission • Asexual/sexual reproduction Domains Symbioses: close relationships between two species. Commensalism: Antbirds! Mutualism: Trichonympha Parasitism: Trypanosoma Predation: Amoeba Some things to check yourself on: What do you know about protists? What is the correct way to write a taxonomic name, using binomial nomenclature? Can you explain the difference between grouping organisms by morphology and relatedness? What does it mean to group things hierarchically? Why do we use the Linnean hierarchy, if only ‘species’ are biologically relevant? And what does that mean? Can you assign all the organisms you have seen to the correct domains, kingdoms, and phyla - and whether they are pro- or eukaryotic? …and of course, the display boards… :)
