biog1101 Lecture 8- Composition of Cells

biog1101 Lecture 8- Composition of Cells - Lect 8...

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Lect. 8- Composition of Cells  (Dr. Esther Angert) 12:58 Announcements: Guest lecturer all week- Dr. Esther Angert Science Cabaret- Tuesday Sept. 16 7pm  o Lost Dog Lounge 112Cayuga St. Downtown Ithaca, NY   Bio Dining Discussion o Monday 9/15/08 Appel Dining Hall 302AB 5:45pm Cytology- The Biology of the Cell 1. Scale of life and the Cell 2. Using Microscopy and Biochemistry 3. Prokaryotic vs. Eukaryotic Cells o fundamental similarities o fundamental laws 4. Parts of the Bacterial Cell 5. Parts of the Eukaryotic Cell The Scale of Life Organisms range in mass (size) over 21 orders of magnitude o Smallest microbe weight <10^-13g o Most cells falls within a fairly narrow size range
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To survive cells must exchange molecules with their environment o Exchange velocity is directly related to the cell surface area relative to its  volume (review figure 6.7 in book) Exceptions: follow rule of high surface to volume area Thiomargarita “sulfur pearl” Caulobacter cescentus Bacterium that inhabits low nutrient, freshwater environment When starved for phosphate its stalk grows longer to increase its  surface area We use this strategy too Intestinal epithelial cells absorb nutrients from foods we eat Microvilli increase surface area o Eukaryotic cels are generally larger than prokaryotic cells (bacterial and archaeal cells) o Eukaryotic cells have membrane bound, subcellular compartments to  organize function Prokaryote vs. Eukaryote Prokaryote: Nucleoid (not membrane bound) Small simple looking cells when compared to eukaryotic cell Bacteria + Archaea
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biog1101 Lecture 8- Composition of Cells - Lect 8...

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