BACTERIA
description
Transcript of BACTERIA
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BACTERIA
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1. Bacteria are classified into two kingdoms: Eubacteria (true bacteria) and Archaebacteria (Ancient Bacteria).2. BACTERIA are microscopic Prokaryotes. (“before nucleus”)3. Adapted to living in all environments (even some extreme) – they exist EVERYWHERE
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1. Outside the plasma membrane of most cells is a rigid cell wall that keeps the cell from bursting or collapsing due to osmotic changes by peptidoglycan, a complex molecule containing a unique amino disaccharide and peptide fragments.
a. The cell wall may be surrounded by an organized capsule called a glycocalyx and/or by a loose gelatinous sheath called a slime layer.
b. In parasitic forms, these outer coverings protect the cell from host defenses.
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Bacteria Structure
5. Nucleoid region contains a circular loop of DNA
6. Plasmids are rings of DNA, used in reproduction
7. Ribosomes in cytoplasm synthesize proteins
2. Flagella is used for movement
3. Pilli (Fimbrae) help bacteria cling to surfaces
4. Prokaryotes do not have organelles or a membrane bound nucleus!
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Cell Membrane – regulates what comes in and out of the cell
Cell Wall – maintains shape and form
Capsule – found in virulent bacteria, helps evade immune system
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Binary fission is the splitting of a parent cell into two daughter cells; it is asexual reproduction in prokaryotes.
I
II. Reproduction in Prokaryotes
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In bacteria, genetic recombination can occur in three ways.
a. Conjugation occurs when a bacterium passes DNA to a second bacterium through a tube (sex pilus) that temporarily joins two cells; the plasmid (DNA) is then exchanged
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b.Transformation involves bacteria taking up free pieces of DNA secreted by live bacteria or released by dead bacteria.
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c. In transduction, bacteriophages transfer portions of bacterial DNA from one cell to another. Plasmids can carry genes for resistance to antibiotics and transfer them between bacteria by any of these processes
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Plasmid – an extra bit of DNA, used in sexual reproduction
Plasmids are also used in genetic engineering
Some bacteria form resistant endospores in response to unfavorable environmental conditions.
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TRANSFORMATION
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III. Prokaryotic Nutrition 1. Bacteria differ in their need for, and tolerance of, oxygen (O2).
a. Obligate anaerobes are unable to grow in the presence of O2; this includes anaerobic bacteria that cause botulism, gas gangrene, and tetanus.b. Facultative anaerobes are able to grow in either the presence or absence of gaseous O2.c. Aerobic organisms (including animals and most prokaryotes) require a constant supply of O2 to carry out cellular respiration.
staphylococcus is a gram-positive, facultative anaerobe
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2. Autotrophic Prokaryotes
a. Photoautotrophs are photosynthetic and use light energy to assemble the organic molecules they require.b. Chemoautotrophs make organic molecules by using energy derived from the oxidation of inorganic compounds in the environment. (methanogens)
Check out the virus and bacteria gallery
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THERMOACIDOPHILE – the red stuff on the rocksThis is an archaebacteria.
THE FUTURE BELONGS TO ARCHAE!
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3. Heterotrophic Prokaryotes
a. Most free‑living bacteria are chemoheterotrophs that take in pre-formed organic nutrients.b. As aerobic saprotrophs, there is probably no natural organic molecule that cannot be broken down by some prokaryotic species. c. Detritivores (saprophytic bacteria) are critical in recycling materials in the ecosystem; they decompose dead organic matter and make it available to photosynthesizers.
Bacteria have an important role to play in breaking down materials in the environment.
Some are harmful and break down material we'd rather keep, like this image of an infection of necrotizing fasciitis (flesh-eating bacteria)
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Bacteria Shape & Naming
The Gram stain procedure (developed in the late 1880s by Hans Christian Gram) differentiates bacteria.
a. Gram‑positive bacteria stain purple, whereas Gram‑negative bacteria stain pink.
b. This difference is dependent on the thick or thin (respectively) peptidoglycan cell wall.
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Bacteria Shapes
Cocci – spheres
Bacilli – rods
Spirilla - spirals
Staph – in clusters
Strep – in chains
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Streptococcus
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Streptococcus
Strains are responsible for strep throat, and flesh eating bacteria
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Staphylococcus aureus
Staph means “bunch of grapes” in greek.
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Staph Infection
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Tetanus
Rigid muscles from tetanus infectionAlso known as “lockjaw”
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Clostridium botulism
Gram positive
Causes food poisoning that is sometimes fatal
All forms lead to paralysis that typically starts with the muscles of the face and then spreads towards the limbs.[1] In severe forms, it leads to paralysis of the breathing muscles and causes respiratory failure. In view of this life-threatening complication, all suspected cases of botulism are treated as medical emergencies, and public health officials are usually involved to prevent further cases from the same source.[1]
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A form of botulism is used in BOTOX treatments, as it paralyzes the muscles of the face and effectively smooths wrinkles.
Results may vary.
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Yersinia Pestis
The black plague, this bacteria was carried on the fleas of rats. It was responsible for the deaths of thousands of Europeans from the 8th to the 14th century.
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Bacillis Anthracis (Anthrax)
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Bacillus (unknown strain)
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MycoplasmasCauses pneumonia
Rickettsia rickettsi
Rocky Mountain Spotted Fever, carried by ticks
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E. Coli
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Spirilla Bacteria
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Salmonella
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Plush Germs
Syphilis E. Coli
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Gonorrhea
The Plague (Black Death)
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