Copyright Notice! This PowerPoint slide set is copyrighted by Ross Koning and is thereby preserved for all to use from plantphys.info for as long as that website is available. Images lacking photo credits are mine and, as long as you are engaged in non-profit educational missions, you have my permission to use my images and slides in your teaching. However, please notice that some of the images in these slides have an associated URL photo credit to provide you with the location of their original source within internet cyberspace. Those images may have separate copyright protection. If you are seeking permission for use of those images, you need to consult the original sources for such permission; they are NOT mine to give you permission. Cell Structure Prokaryotic before nucleus Eukaryotic true nucleus 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! http://content.answers.com/main/content/img/scitech/HSmatthi.jpg http://home.tiscalinet.ch/biografien/images/schwann.jpg Cell Theory 1839 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. Eukaryotic Cell Structure Chloroplast -photosynthesis Middle Lamella-pectin glue Cell Wall-cellulose+protein Cell Membrane-phospholipid -transport proteins Cytosol-enzymes for -fermentation -glycolysis 70S ribosomes naked, circular DNA Mitochondria -respiration 70S ribosomes naked, circular DNA Vacuoletoxic waste processing Vesicles -import/export package Golgi Apparatus -sorting -packaging Nucleus-DNA linear histone bound -transcription -replication Endoplasmic Reticulum -internal transport 80S Ribosomes -protein synthesis -translation Other eukaryotic organelles have been omitted here!