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2. Cell Structure Prokaryotic beforenucleus Eukaryotic truenucleus

3. Comparing Cell Sizes Mycoplasma 0.3-0.8 µm E. coli 1x2 µm Cyanobacteria 10 µm diam Plant Cell 30x75 µm Obviously eukaryotic Nucleus present Mitochondrion  Bacterium Chloroplast  Cyanobacterium Endosymbiosis: Eukaryotes are Chimeras!

4. Theodor Schwann Prussian Zoologist 1810-1882 Matthias Schleiden German Botanist 1804-1881 1. All living organisms consist of one or more cells. 2. Some organisms are unicellular, so cells are the fundamental unit of life. 3. New cells come from pre-existing cells by cell division. We can now add: 4. Cells must show all the properties of life. 5. All cells are basically similar in chemical and structural composition. http://home.tiscalinet.ch/biografien/images/schwann.jpg http://content.answers.com/main/content/img/scitech/HSmatthi.jpg Cell Theory 1839

5. Vacuole- toxic waste processing Eukaryotic Cell Structure Middle Lamella-pectin glue Cell Membrane-phospholipid -transport proteins Cytosol- enzymes for -fermentation -glycolysis Nucleus-DNA linear histone bound -transcription -replication Endoplasmic Reticulum -internal transport 80S Ribosomes -protein synthesis -translation Golgi Apparatus -sorting -packaging Vesicles -import/export package Mitochondria -respiration 70S ribosomes naked, circular DNA Cell Wall-cellulose+protein Chloroplast -photosynthesis 70S ribosomes naked, circular DNA Other eukaryotic organelles have been omitted here!