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Computer Filename: pkvsek.ppt. Prokaryotes vs Eukaryotes. Hugh B. Fackrell. Presentation Outline. Major Groups of Organisms Classification of Organisms Prokaryotes vs Eukaryotes. Background Terms & Concepts. Proteins Membranes (membr.ppt)
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Computer Filename: pkvsek.ppt Prokaryotes vs Eukaryotes Hugh B. Fackrell
Presentation Outline • Major Groups of Organisms • Classification of Organisms • Prokaryotes vs Eukaryotes
Background Terms & Concepts • Proteins • Membranes (membr.ppt) • Formation of lipid bilayers (membr.ppt) • Prokaryotes • Prokaryotes vs eukaryotes • Evolution of eukaryotes
Basic unit of all organisms in the various kingdoms Cell membrane Protoplasm Genetic information DNA & RNA Cell
Major Groups of Organisms • Plants • Animals • Fungi • Protista • Prokaryotes • Viruses
Major Groups of Organisms • Plants: • photosynthetic, inorganic food • Animals: • non photosynthetic, organic food
1 of 2 Major Groups of Organisms • Fungi: • non photosynthetic, organic food, • microscopic, filamentous • Subgroups • Yeasts • True fungi • molds,rusts, smuts, mushrooms
Protista • Microscopic eukaryotes • Food organic or inorganic • Some photosynthetic • Examples • Slime molds • Algae • Protozoa
Prokaryotes • Characteristics • No nucleus or nuclear membrane • Microscopic • Food organic or inorganic • Some photosynthetic • Bacteria • Cyanobacteria • Eubacteria • Archaea (archaebacteria)
Viruses • Non cellular • Reproduce only in living host cells • Food from living cells • By infection only • ONE nucleic acid • DNA viruses • RNA viruses • Protective protein coat
Viroids • Special subgroup of viruses that lack the protective protein coat
Prions • Mad cow disease, scrapie • “Infectious” proteins • genetically coded by animal • 2 configurations of same protein • One form harmless • Second form pathologic • Pathological configuration acts as a template to convert harmless form
Classification of Organisms • From Fossil Record & Morphology • Five Kingdoms- plants, animals,fungi , protistia, prokaryotes • Prokaryotes - Eubacteria, Archeobacteria • From Cellular organization • Three kingdoms- Eubacteria, Archaebacteria, Eukaryotes
Empires • Level of organization above the kingdom level • Archaea(formerly Archaebacteria) • Bacteria ( formerly Eubacteria) • Eucarya (plants, animals, protista, fungi)
Prokaryotes No nuclear membrane DNA in ONE molecule free in cytoplasm No membrane bound organelles No cytoskeleton Eukaryotes Nuclear membrane DNA organized in several molecules (chromosomes) Many different membrane bound organelles Cytoskeleton Prokaryotes vs Eukaryotes
Prokaryotes (details) • Size:1-10 m • Flagella: simple, 2 proteins • Capsule: extracellular polymer • Cell wall: usual, complex • Plasma membrane: no carbohydrates or sterols • Ribosomes: small(70S) • Cell division: binary fission
Eukaryotes (details) • Size:10-100 m • Flagella: Complex, many microtublules • Capsule: none • Cell wall: if present chemically simple • Plasma membrane:Sterols & carbohydrates • Ribosomes: large (80S) in cytoplasm • small(70S) in organelles • Cell division: mitosis
Summary • Simple cells • Single circular chromosome • 1-2 microns in size • few internal compartments or organelles • Complex Cell Wall common • Cell wall unique