BIO 182Bang, Michel (Christofer)2013 SpringWeek 2Lecture 3January 23Binary Fission- Asexual reproduction1. Single DNA molecule replicates2. Cell Membrane (CM) grows between the two DNA molecules3. Bacterium is about double its original size, the CM begins to fold inward4. Cell Wall (CW) forms between 2 DNA molecules dividing the original cell into two identical daughter cellCells- Units of Life- All living organisms composed of cells- Com from preexisting cellsSteps proceeding to Origin of Eukaryotic Cells- Flexible cell surface-Prokaryotic CW lost, Cells can grow largerd- Cytoskeleton-allows cells to change shape and move material around the cell, including daughter chromosomes- Nuclear Envelope- Appearance of Digestive Vacuoles- Acquisition of some organelles by EndosymbiosisPrimary Endosymbiosis - Flexible Prokaryote engulfs another Prokaryotes EurkaryoteOne Eukaryote engulfed a cyanobacteriumParamecium Bursaria (2nd Endosymbiosis)- EATS blue green algae- Instead of digesting the algae, the bursaria hold the algae and moves them around to patches of sunlight- Algae photosynthesize, producing food for both Algae and P. bursariaMitochondria- Have their own membranes- DNA in a simple circular genome- Reproduction by binary fissionThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.Endoplasmic Reticulum-RibosomesGolgi Apparatus-Protein packagingNucleus-ChromosomesAdvantage of Compartmentalization- Cell process can be concentrated in local areas- Reduces diffusion time problem- Increases Max cell size- Allows (and requires) more complex genome- Increased complexity allows multicellularityMitochondria and Chloroplasts1. Similar size to Bacteria2. Bacteria-like DNAOne circular chromosomeFew ProteinsReplicate like bacterial DNA3. Bacteria-like Ribosomes4. Can make new copies independently of cell5. Mitochondrial genome looks like Proteobacteria**Know
View Full Document
Unlocking...