BIODIVERSITY I BIOL 1051 What are Bacteria? INTRODUCTION WHAT ARE MICROORGANISMS? INTRODUCTION WHAT ARE MICROORGANISMS?
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1 BIODIVERSITY I BIOL 1051 INTRODUCTION WHAT ARE MICROORGANISMS? Professor Marc C. Lavoie marc.lavoie@cavehill.uwi.edu Seen only under the microscope Usually unicellular INTRODUCTION WHAT ARE MICROORGANISMS? INTRODUCTION WHAT ARE MICROORGANISMS? : No nucleus No organelles (mitochondria, chloroplast, Golgi, etc.) EUKARYOTES: Nucleus Organelles Internal membrane system MICRO-ORGANISMS MICRO-ORGANISMS EUKARYOTES VIRUSES EUKARYOTES VIRUSES BACTERIA ARCHAE A AMOEBOZOA OPISTOKONTA RHIZARIA ARCHAEPL ASTIDA CHROMALVEOLATA EXCAVATA BACTERIA ARCHAE A AMOEBOZOA OPISTOKONTA RHIZARIA ARCHAEPL ASTIDA CHROMALVEOLATA EXCAVATA 1
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3 Prokaryote A= Cell wall B= Cytoplasm C= Nucleoid D= Cytoplasmic membrane 70S Ribosomes 16S r-rna Eucaryote A= Rough endoplasmic Reticulum B= Microtubules C= Nucleus D= Chloroplast E= Mitochondria F= Peroxysome G= Golgi Complex 80S Ribosomes 18S r-rna 3. Bacteria usually range in size from 0.2 µm (10-6 m) to 50 µm. 3
4 A giant bacterium has however been isolated and it measure 0.6 mm in length (600 µm)! Thiomargarita namibiensis In 1993 this bacteria measuring 750 µm (0.75 mm) in diameter was found! 4. Do you know that at this precise moment we are standing on Do you know that at this precise moment we are standing on Bacteria??
5 4. Bacteria are everywhere Temperature range: -2 C to 95 C ph range: 2 to 9 Presence or absence of oxygen High salt concentrations High sugar concentrations
6 Capsule: slimy layer, consisting of polysaccharide and water surrounding many cells. Also called slime coat, extra cellular layer, glycocalyx, etc. Difficult to stain, since it is mostly water Cell Wall: rigid layer surrounding the bacterial cell. Made of peptidoglycan in Bacteria (other materials in Archaea). Porous to movement of small molecules Cell Membrane: flexible, semi-permeable barrier with lipid center that controls diffusion in and out of cell. 4. Cytoplasm: the fluid-filled space inside the cell. Contains hundreds of different enzymes, along with ribosomes, DNA, RNA, and a "pool" of millions of small molecules and ions. 6. Bacterial structures 6
7 6. Ribosomes: particles made of protein and RNA, sites of protein assembly. Ribosomes may occupy 25% of the volume of a typical bacterial cell Cell Chromosome: the DNA of a cell, normally a single circular molecule that is tightly supercoiled and packed inside the cell. Actively dividing cells may contain 2 or even 4 copies of this chromosome, replicated and ready for dividing among future daughter cells Flagella: -Associated with motility - Complex structure: several proteins anchored in cell wall and membrane. - Only one type of protein: flagellin. - Rotates at expense of proton motive force, which drive the flagellar motor Endospore: - Highly resistant differentiated bacterial cell - Produced by certain types of Bacteria. - Formation => dehydrated spore coat - Contains: calcium dipicolinate and small soluble acid proteins, absent from vegetative cells. - Can remain dormant indefinitely - Germinate quickly when appropriate trigger is applied. 7. Bacterial growth: increase in the number of cells rather than an increase in the size of individual cells. Multiplication of most bacterial cells occurs by binary fission. 7
8 Cell Growth and Binary Fission Cell growth: > 2000 chemical reactions Small molecules => polymers => macromolecules => Cell structures - Elongation of cell - Duplication of DNA - Septum formation - Separation of two daughter cells 8. ORGANISMS ENERGY SOURCE ELECTRON DONNOR CARBON SOURCE AUTO- Algae (CO 2 ) Certain Protists LITHO- Plants PHOTO- HETERO- (Inorganic compounds and C 1 ) None (Light) (CH 2 O) n ORGANO- AUTO- None (Organic compounds) HETERO- AUTO- LITHO- HETERO- CHEMO- (Chemical compounds) AUTO- ORGANO- Most Protists HETERO- Fungi Plants (non-chlorophyllic) Animals MADIGAN, MT, MARTINKO, JM, DUNLAP, PV & CLARK DP Brock Biology of Microorganisms, 12th ed, 2009, Pearson, Benjamin Cummings, p. 1-49, PURVES, WK, SADAVA, D, ORIANS, GH, HELLER, HC. Life, The Science of Biology, 6th ed, 2001, Sinauer Assiciates Inc., p. 58, 245, PRESCOTT, LM, HARLEY, JP, KLEIN, DA. Microbiology, 3rd ed, 1996, Wm C. Brown Publishers, A Times Mirror Company, p , ,
9 html g = = =059B0000&idx= /bactanat.html ructure/membranegen.html ct2.html tructure/cellwall.html tructure/cellwall.html html ructure/flagella.html ission.jpg PG 9
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