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Why is a knowledge of microbiology important? |
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- [image][image][image][image]knowledge of microorganisms
- allows humans to prevent food spoilage & disease occurance
- led to aseptic techniques to prevent contanimation in medicine and microbiology labs
- helps us to read/understand lab reports so that we can better assist Dr. & patients & protect ourselves as nurses
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study of protozoa and parasitic worms |
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Recombinant DNA technology
or genetic engineering |
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involves microbial genetics and molecular biology |
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first described live microorganisms |
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- discovered relationship between microbes & disease, immunity and antimicrobial drugs
- Ended the debate over Spontaneous Generation
- demonstrated that spoilage bacteria could be killed by heat (pasteurization is the application of a high heat for a short time)
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- showed that microbes are in the air and can spoil food and cause diseases
- used a chemical disinfectant to prevent surgical wound infections
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proved that a bacterium causes anthrax and provided the experimental steps, Koch's postulates, to prove that a specific microbe causes a specific disease |
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inoculated a person with cowpox virus, who was then protected from smallpox |
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Describe activities of microbes that benefit human welfare. |
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- Microbial Ecology- bacteria recycle carbon, nutrients, sulfu & phosphorus that can be used by plants & animals
- Bioremediation- Bacteria degrade organic matter in sewage, bacteria degrade or detoxify pollutants such as oil and mercury.
- Biological Insecticides- microbes that are pathogenic to insects & alternatives to chemical pesticides (Bacillus thuringiensis)
- Biotechnology- the use of microbes to produce foods and chemicals
- Biotechnology- recombinant DNA technology enables bacteria and fungi to produce a variety of proteins including vaccines and enzymes
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Define Binomial Nomenclature and discuss it's purpose |
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Definition
(genus + specific epthet)
can be used world wide |
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- Prokaryotes- single cells with no defined nucleus
- Peptidoglycan cell walls
- Divide by binary fission
- use organic chemicals, inorganic chemicals or photosynthesis for energy
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- Prokaryotic
- Lack peptidoglycan
- Live in extreme environments
- Include-
- Methanogens
- Extreme Halophiles
- Extreme thermophiles
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- eukaryotic cells which have a defined visible nucleus and divide by mitosis
- Kingdoms
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multicellular, no cell walls, chemoheterotrophic |
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Multicellular, cellulose cell walls, usually photoautotrophic |
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Chemoheterotrophic, unicelular or multicellular, cell walls of chitin |
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A catch all for eukaryotic organisms that do not fit other kingdoms- protozooans |
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What is meant by bacterial strains and types? |
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Definition
Variations within a species are called:
Types- usually a serological designation
Strains- usually a biochemical or morphological |
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Cite the characteristics of viruses |
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Definition
- Acellular- not cells
- Consist of DNA or RNA core
- Core is surrounded by a protein coat- capsid
- Coat may be enclosed in a lipid envelope
- Viruses are replicated only when they are IN a living host cell- obligate intracellular paracites
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flagella distributed all over the cell |
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at one or both poles or ends of a cell
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a single flagellum at one pole |
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A tuft of flagella coming from one pole |
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flagella at both poles of the cell |
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What size diameter do most bacteria come in |
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What are the basic shapes of a bacterial cell? |
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Name the Cocci & describe |
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Definition
diplococci (pair)
streptococci (chainlike)
tetrads (4)
sarcinae (cubelike groups of 8)
staphylococci (grapelike clusters)
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Name and describe the Bacilli |
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Definition
Diploblaccilli (2)
Streptobacilli (chains)
coccobacilli (look like cocci & are rare) |
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Name & describe Spiral bacteria |
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Definition
Vibrios (curved rods)
Spirilla (helical shape & rigid)
spirochetes (helical & flexible, have an axial filament for movement) |
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sugar coating surrounding cells
viscous & sticky
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- The glycocalyx that is organized and firmly attached to the cell wall
- Determined by gram staining
- Used for protection against phagocytes
- formation of biofilms come from this layer
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when glycocalyx is unorganized and only loosely attached to the cell wall |
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Definition
- Found in all bacterial cells
- made up of phospholipids & proteins
- no carbs & usually no sterols
- used for transport of chemicals in and out of cell & carries out functions concerning cellular respiration and other enzymatic activities
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Only found in spirochetes
anchored at one end of a cell
rotation causes movement (think corkscrew or barber pole) |
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Definition
- can occur at the poles or be evenly distributed over a bacterial cell
- a few to several hundred per cell
- adhere to each other and surfaces
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- longer than fimbriae
- only 1 or 2 per cell
- involved in motility & DNA transfer
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- Composition of a bacterial cell wall
- Polymer of disaccharide (NAG & NAM are connected & alternate) The chains are bonded by peptides
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thick, rigid layer of peptidoglycan
contain teichoic acid (look like a long, black hair)
"built like a wall" |
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Definition
- Thin layer of peptidoglycan & outer membrane on wall
- periplasm forms between the outer membrane & plasma membrane, making it hard to get antibiotics through
- peptidoglycan is bonded to lipids in the outer membrane
- "Built like a patio"
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Definition
- Acid-fast cell walls with no outer membrane
- contains waxy lipid bound to the peptidoglycan, making it resistent to drying
- Mycobacterium (TB) & Nocardia are examples
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Name the Appendages of a cell |
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Definition
Flagella
Axial Filaments
Fimbriae
Pili |
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Induces an immune response in a host
(our body will view it as foreign and threatening) |
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Name the Surface Layers of a Bacterial Cell |
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Definition
Capsule (in some)
Cell Wall (in most)
Plasma Membrane (in all) |
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Name the Cytoplasmic Structures |
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Definition
Nucleoid
Plasmid
Ribosomes
Inclusion
Endospores |
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Definition
- singular piece of double stranded DNA
- controls all activities of cell
- DNA--->RNA--->Protein
- DNA--->DNA (replicates for reproduction)
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- small extra chromosmal piece of circular DNA 5-100 genes long
- for adaptation- can carry genes for drug resistance used in recombinent DNA technology
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- RNA and protein (70S)
- site of protein synthesis (RNA--->protein)
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- phosphate granules, starch, lipid, sulfur
- used for storage
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- condensed, dormant cell stage containing all vital cell components
- survival is key function
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