03 Ch4 Prok & Euk Notes - Biol 127 Prokaryotes &...

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Biol 127 Ch 4: pgs. 79-106, 111-115 Recall Cell Theory: All living things can be categorized on the basis of ______________________________ as: What do we already know about Prokaryotes & Eukaryotes? Main difference between Prokaryotes & Eukaryotes is: What living things are … Prokaryotes? Eukaryotes? Where are humans? Where are microbes? - Who are the microbes? - Where do they fit?
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Differences between Prokaryotes and Eukaryotes: [distilled from Tab 4.1, p 80] Prokaryotes Eukaryotes Number of cells/organism Unicellular organisms Some unicellular; most multicellular Size Smaller Larger Nucleus Absent; No nuclear membrane Well-defined, with nuclear membrane present Genetic material Single circular chromosome Multiple linear chromosomes in a nucleus Membranes Cell membrane only Cell membrane and membrane- bound organelles in the cytoplasm Energy-generating organelles Absent; energy-generating reactions occur on the cell membrane Present; Mitochondria & chloroplasts involved in energy generation Ribosomes (for protein synthesis) Present; smaller and structurally different than eukaryotes Present; larger and structurally different than prokaryotes Cell wall – structures outside cell membrane Almost all have cell wall; contains peptidoglycan Present in some organisms: - Contains chitin in fungi - Contains cellulose in plants - Absent in animals Motility organelles Flagella – rotating movement (No cilia) Flagella – whipping movement Some cells/orgs. have cilia Cell division Binary fission Mitosis and/or meiosis Reproduction Only asexual reproduction Sexual and/or asexual reproduction Prokaryotic Cells (Bacterial Cells) Cell size - Prokaryotes are the smallest living things - Prokaryotes typically range in size from 0.5-2.0 µm - Eukaryotic cells are at least 10 times larger than prokaryotic cells
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Refresher: Units of Measure [See p 53-54 & Table 3.1 in textbook; also Appendix A] meter (m) millimeters (mm) micrometers (microns, µm, µ) nanometers (nm) There are 3 decimal places between each unit: 1 m = _________ mm 1 mm = _________ µm 1 µm= _________ nm 1 meter (m) = 1000 millimeters = 10 3 mm = 1,000,000 micrometers = 10 6 microns (µm, µ) = 1,000,000,000 nanometers = 10
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This note was uploaded on 02/21/2012 for the course MICROBIOLO BI127 taught by Professor Leunk during the Spring '09 term at Grand Rapids Community College.

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03 Ch4 Prok & Euk Notes - Biol 127 Prokaryotes &...

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