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Prokaryotes Kingdoms Eubacteria & Archaebacteria.

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Presentation on theme: "Prokaryotes Kingdoms Eubacteria & Archaebacteria."— Presentation transcript:

1 Prokaryotes Kingdoms Eubacteria & Archaebacteria

2 Prokaryote Before nucleus Characteristics: Unicellular 1-5 μm diameter Cell walls -Maintains shape -Provides protection -Prevents lysis in a hypotonic environment

3 PROKARYOTESEUKARYOTES Size1-10 microns microns Complexityunicellular, rarely small colonies sometimes unicellular more often multicellular Membrane bound organelles nonenuclei, mitochondria, chloroplasts, lysosomes, endoplasmic reticulum, golgi, & vacuoles d) Nucleusnoyes e) Chromosomes single & circularusually several & linear f) Introns & Exons occasionallyfrequent g) Histonesnoyes h) Ploidyhaploiddiploid i) Mitosis & Meiosis absentpresent j) Sexual reproduction none, or unidirectional from donor to recipient usually, involves fusion of haploid gametes l) Cytoskeletonabsentmicrotubules and microfilaments m) Cell wallusually present, contains peptidoglycan absent in animals present in fungi (chitin) & plants (cellulose) n) Motilitysimple, prokaryotic, flagella, gliding motion complex "9+2" flagella or cilia with centrioles o) Endocytosis & cytoplasmic streaming absentpresent p) Differentiatio n usually absentcells differentiate to form tissues & organs q) Energy metabolism many diverse pathways in various bacteria glycolysis in cytoplasm, Krebs Cycle and ETC in mitochondria r) Oxygenaerobic and/or anaerobic usually aerobic

4 PROKARYOTESEUKARYOTES a) Size1-10 microns microns b) Complexityunicellular, rarely small colonies sometimes unicellular more often multicellular c) Membrane bound organelles nonenuclei, mitochondria, chloroplasts, lysosomes, endoplasmic reticulum, golgi, & vacuoles Nucleusnoyes Chromosomessingle & circularusually several & linear IntronsRarelyfrequent Histonesnoyes h) Ploidyhaploiddiploid i) Mitosis & Meiosis absentpresent j) Sexual reproduction none, or unidirectional from donor to recipient usually, involves fusion of haploid gametes l) Cytoskeletonabsentmicrotubules and microfilaments m) Cell wallusually present, contains peptidoglycan absent in animals present in fungi (chitin) & plants (cellulose) n) Motilitysimple, prokaryotic, flagella, gliding motion complex "9+2" flagella or cilia with centrioles o) Endocytosis & cytoplasmic streaming absentpresent p) Differentiatio n usually absentcells differentiate to form tissues & organs q) Energy metabolism many diverse pathways in various bacteria glycolysis in cytoplasm, Krebs Cycle and ETC in mitochondria r) Oxygenaerobic and/or anaerobic usually aerobic ProkaryotesEukaryotes

5 PROKARYOTESEUKARYOTES a) Size1-10 microns microns b) Complexityunicellular, rarely small colonies sometimes unicellular more often multicellular c) Membrane bound organelles nonenuclei, mitochondria, chloroplasts, lysosomes, endoplasmic reticulum, golgi, & vacuoles Nucleusnoyes Chromosomessingle & circularusually several & linear IntronsRarelyfrequent Histonesnoyes Ploidyhaploiddiploid Mitosis & Meiosis absentpresent Sexual reproduction none, or unidirectional from donor to recipient usually, involves fusion of haploid gametes l) Cytoskeletonabsentmicrotubules and microfilaments m) Cell wallusually present, contains peptidoglycan absent in animals present in fungi (chitin) & plants (cellulose) n) Motilitysimple, prokaryotic, flagella, gliding motion complex "9+2" flagella or cilia with centrioles o) Endocytosis & cytoplasmic streaming absentpresent p) Differentiatio n usually absentcells differentiate to form tissues & organs q) Energy metabolism many diverse pathways in various bacteria glycolysis in cytoplasm, Krebs Cycle and ETC in mitochondria r) Oxygenaerobic and/or anaerobic usually aerobic ProkaryotesEukaryotes

6 Bacteria Single-celled prokaryotes Two kingdoms of bacteria: Archaebacteria Eubacteria

7 Archaebacteria Methanogens: Anaerobic bacteria (oxygen is a poison) Produce energy by converting H 2 & CO 2 into methane gas. Live in swamps & marshes Extreme Halophiles: Salt-loving" bacteria that use salt to generate ATP for energy. Thermoacidophiles: Live in extremely acidic environments (pH less than 2) that have extremely high temperatures (up to 110 o C). e.g. geothermal springs at Yellowstone National Park.

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9 Archaebacteria

10 Eubacteria Contains the bacteria commonly referred to as germs. This kingdom contains most of the world's bacteria Eubacteria are classified by: Shape Clustering Respiration

11 Eubacteria Shape Coccus - round Bacillus - rod-shaped Spirillum - spiral-shaped

12 Eubacteria Clustering Diplo - a prefix used with the shape name to indicate pairing of cells. Strepto - a prefix used with the shape name to indicate chains. Staphylo - a prefix used with the shape name to indicate clusters

13 Streptococcal (Group A) Infections

14 Susceptibility & Resistance

15 Eubacteria Respiration Obligate anaerobes - cannot survive in the presence of atmospheric oxygen. Facultative anaerobes - can live with or without atmospheric oxygen. Obligate aerobes - cannot survive without atmospheric oxygen. MRSA Staphylococcus aureus

16 The acronym MRSA stands for methicillin- resistant Staphylococcus aureus

17 Maggots Rid Patients Of Antibiotic-resistant Infection, MRSA ScienceDaily (May 5, 2007) University of Manchester researchers are ridding diabetic patients of the superbug MRSA - by treating their foot ulcers with maggots.

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20 Gangrene

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22 Tetanus

23 Necrotizing Fasciitis

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26 Leprosy

27 Helicobacter pylori

28 Lyme Disease

29 Gram Staining Many antibiotics have no effect on gram-negative bacteria

30 Gram-positive. Gram-positive bacteria have a cell wall with a large amount of peptidoglycan that traps the violet dye in the cytoplasm. The alcohol rinse does not remove the violet dye, which masks the added red dye. Gram-negative.Gram-negative. Gram-negative bacteria have less peptidoglycan, and it is located in a layer between the plasma membrane and an outer membrane. The violet dye is easily rinsed from the cytoplasm, and the cell appears pink or red after the red dye is added.

31 (a) Gram-positive. Gram-positive bacteria have a cell wall with a large amount of peptidoglycan that traps the violet dye in the cytoplasm. The alcohol rinse does not remove the violet dye, which masks the added red dye. (b) Gram-negative. Gram-negative bacteria have less peptidoglycan, and it is located in a layer between the plasma membrane and an outer membrane. The violet dye is easily rinsed from the cytoplasm, and the cell appears pink or red after the red dye is added. Figure 27.3a, b Peptidoglycan layer Cell wall Plasma membrane Protein Gram- positive bacteria 20 m Outer membrane Peptidoglycan layer Plasma membrane Cell wall Lipopolysaccharide Protein Gram- negative bacteria Using a technique called the Gram stain – Scientists can classify many bacterial species into two groups based on cell wall composition, Gram-positive and Gram-negative

32 Bad bacteria - toxic

33 Toxins Substances that disrupts the metabolism of other organisms. Endotoxin - made up of lipids and carbohydrates associated with the outer membrane of gram-negative bacteria. These toxins are some of the strongest poisons known to man and cause violent reactions in host organisms. Exotoxin - proteins produced inside gram-positive bacteria cells and secreted into the environment. These toxins usually produce fever, weakness, and capillary damage.

34 Parts of a bacteria cell Cell wall - some rigid and others flexible. Cell membrane - same as other cells. Cytoplasm - same as other cells. DNA - a single, circular chromosome (Plasmid) located in the cytoplasm. Bacteria do not have a nucleus. Capsule - a thick, gel-like, protective coating on some bacteria cells. Pili - short, hairlike protein structures on the surface of some bacteria that help them stick to host cells. Flagella - long protein structures that turn to propel some bacteria cells.

35 200 nm Capsule Figure 27.4 The cell wall of many prokaryotes – Is covered by a capsule, a sticky layer of polysaccharide or protein

36 200 nm Fimbriae Figure 27.5 Fimbriae and pili – allow bacteria to stick to their substrate or other individuals in a colony

37 Taxis – movement toward or away from a stimulus + chemotaxis = movement toward chemical - chemotaxis = movement away from chemical

38 Flagellum Filament Hook Cell wall Plasma membrane Basal apparatus 50 nm

39 Reproduction Asexual, by binary fission - the DNA replicates and then the cell pinches inward and splits in two. Conjugation - two cells exchange a portion of their DNA across a bridge formed between the cells. New material replaces old material in the cell. While this increases the genetic variability in the organisms, it is not true sexual reproduction. Endospores - during adverse conditions, the DNA is encased in a protective envelope. This endospore can lie dormant for years or until favorable conditions return.

40 Binary Fission

41 Conjugation

42 Endospores Endospore 0.3 m Figure 27.9 Can remain viable in harsh conditions for centuries

43 Prokaryotic Metabolism

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45 Antibiotics Drugs that fight bacteria by interfering with their cellular functions. PENICILLIN interferes with cell wall synthesis. TETRACYCLINE interferes with protein synthesis. Many antibiotics are derived from chemicals that bacteria or fungi produce. SULFA DRUGS - antibiotics that are synthesized in laboratories Many Antibiotics are able to affect a wide variety of organisms; they are called BROAD SPECTRUM ANTIBIOTICS.

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47 Antibiotic Resistance When a population of bacteria is exposed to an Antibiotic, the most susceptible DIE. A Few Mutant bacteria that are resistant to the Antibiotic may continue to grow. A Resistant Population then grows from these Mutant Bacteria through reproduction and genetic recombination. These new Population are Antibiotic-Resistant. This has resulted from the Over Use of Antibiotics. Many diseases that were once easy to treat are becoming more difficult to treat.

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52 USEFUL BACTERIA Used in Sewage Treatment, and as Decomposers, breaking down the remains of organic matter in dead plant and animal waste. Recyclers, returning nutrients back to the environment. Food production. Bacteria help us make buttermilk, sour cream, yogurt, cottage cheese, sauerkraut and pickles. Used in industrial chemical production. They produce organic chemicals and fuels. Theyre used in the mining of minerals and their products are used as insecticides. Used to help clean up environmental disasters caused by humans, such as chemical and oil spills.

53 Prokaryotes are the principal agents in bioremediation – The use of organisms to remove pollutants from the environment

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