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Bacillus
staff/rod-shapde (palachkoobraznii)
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Spirilla
rigid with a spiral/corkscrew shape (speralyavidniy)
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spirochetes
flexible with a piral shape
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Diplo
two cells (pairs) of cocci or baccilli
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Sarcinae
cube of 8 cocci cells
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Staphylo
clusters of cocci cells
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Strepto
chains of cocci cells or bacillus cells
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Haloarcula
square/rectangular shaped cells
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Monomorphic bacteria
bacteria that do not change shape withing the same species.
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Pleomorphic
different shapes within one species
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coccobacillus
between rod and circle
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Glyacocalyx
- sugar coat
- Composed of polysaccharide and or polypeptide
- Can be used as energy source
- protects against dehydration
- Keeps nutrients inside the cell
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3 types of Glycocalyx - the outer layer to the cell wall of bacteria
- Capsule
- Slime layer
- Extracellular polysaccharide
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Capsule
- glycocalyx neatly organized and is firmly attached to the cell wall
- Prevent phagocytosis by the host's immune system
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A slime layer
glycocallys that is unroganized and is loosely attached to the cell wall
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Extracellular polysaccharide (EPS)
is a glycocalyx made of sugars and allosw bacterial cells to attach to various sufraces.
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Flagella
- tails for moving, made of flagellin.
- Anchored withing the cell wall
- tists on its axis-rotates - run and tumble
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Monotrichous - arrangment of flagella
one flagella on one end
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Amphitrichous
one flagella at each end of the cell
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Lophotrichous
2 or more flagella at both ends of the cell
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Peritrichous
many flegella over the entire cell
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Chemotaxis
cell moving to or away from chemical (stimuli)
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Phototaxis
moving to or away from light
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Endoflagella
- partially inside the cell
- in Spirochetes - move like corkscew
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Fimbriae
- shorter, straighter, thinner than flagella and not used for movement.
- Used for attaching to surfaces to form biofilm
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Pilli
- only 1 or 2 per cell
- Trasfer DNA from one bacterial cell to another
- se pilli
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Prokaryotic Cell Wall
- gives strucutre to and ptorects the cell - surrounds the underlyiing plasma membrane
- Prevents somotic lysis
- Cell wall is the site of action for some antibiotics
- Made of Peptidoglycan
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Peptidoglycan of a cell wall
- NAG & NAM -monosacharide linked together(disaccharide) and they repeat
- These disaccharides linked togheter by polypeptides (chains of amino acids) to form lettice surrounding the cell.
- Penicillin inhibits polypeptide formation.-leads to cellular lysis
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Cell wall of Gram-positive bacteria
- Many layer of peptidoglycan
- Teichoic acid - stick to wall of peptidoglycan layer
- Lipoteichoic acid links to palsma membrane
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Cell wall of Gram-negative Bacteria
- Thin peptidoglycan layer between the outer phospholipid bylayer and inter phospolipid bilayr in plasma membrane.
- Outer layer
- Periplasm
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Periplasm in Gram-
- where peptidoglycan found
- contains many digestive enzymes and trasport proteins
- No teichoic acid - more susceptibale to rupture than Gram +
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Outer membrane of Gram - cell wall
- lipopolysaccharides - phospholipid by-layr
- Contains porins - trasport proteins - makes outer membrane permeable
- Lipid A - endotoxin - can cause shock, fever.
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Lysozyme
digests the disaccharides in peptidoglycan
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Penicillin
inhibits the formation of peptide bridges in peptidoglycan
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Protoplast
Gram positive cell whose cell wall has been destroyed, but that is still alive and functional(lost its peptidoglycan)
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Spheroplast
wall-less Gram-negative cell(lost outer membrane and peptidoglycan)
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L forms
wall-less cells that swell into irregular shapes.They can live, divide, and may return to a walled state.
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Plasma membrane
phospholipid bilayer - basic famework of the plasma membrane. All the metabolic machinary - photosynthesis, aerobic respiartion, anaerobic resperaiton reactions.
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3 type of proteins whithin the phospholipid bilayer
- Peripheral proteins
- Integral
- transmembrane protein
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Peripheral proteins
- on top of membrane
- enzymes
- structural proteisn
- some assist the cell in changing membrane shape
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Integral proteins transmembrane proteins
throught the plasma membrane - channels for movement of material into and out of the cell
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Fluis Mosaic Model
- Plasma membrane is as viscouse as olive oil
- Phospholipids rotate and move alterally for proteins to work properly ex. changes shape.
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Plasma membrane and its selective permeability
- allows the passage of some molecules but not others across the plasma membrane
- Ions pass slowly
- lipids easily
- water, oxygen, carbon dioxide, some simle sugars pass easily
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Photosynthetic pigments
chromotophores or thylakoids found of foldings of cells that rquired photosynthesis.
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