Chapter 3- Bacteria and Archaea Flashcards
Prokaryotes differ from eukaryotes in blank and blank
Size and simplicity
Cell shape
Morphology
Spherical morphology
Coccus
Cylindrical morphology, rods
Bacillus
Spiral morphology, rigid helices
Spirillum
Cocci pairs
Diplococci
Cocci Chains
Streptococci
Cocci grape-like clusters
Staphylococci
4 cocci in a square
Tetrads
8 perpendicular cocci
sarcinae
2 Bailli
Diplobacilli
Chains of Bacilli
Streptobacilli
Several parallel Bacilli
Pallisade
Very short rods
Coccobacilli
Comma shaped, resemble rods
Vibrios
Flexible helices
Spirochetes
Network of long, multinucleate filamentous cells
Mycelium
Organisms that are variable in shape
Pleomorphic
Advantage of being a small cell
Greater surface area to volume ratio, allows for greater nutrient exchange
Cell envelope consists of
Structures exterior to cell wall, cell wall, cell membrane
Cell membrane functions
Barrier, regulate transport, energy metabolism, protein attachment, and chemical receptors
Membrane that is somewhat liquid, somewhat solid
Fluid mosaic model
Lipids with polar and non polar ends
Amphipathic lipids
Polar ends
Hydrophilic
Non polar tails
Hydrophobic
Cytoplasmic membrane has blank but not blank
Hopanoids, sterols
Three types of membrane proteins
Peripheral, integral, and transmembrane
Loosely connected membrane protein on cytoplasmic side
Peripheral
Embedded membrane protein that projects outward
Integral
Membrane protein that completely crosses from one side to another
Transmembrane
Lipids in eukaryotic membranes used for strength and stabilization
Sterols
Same as Sterols but in Bacteria
Hopanoids
If membrane is too cold
Solidification
If membrane is too hot
Thermal lysis
To correct fluidity if too cold
Increase unsaturated fatty acids, minimize van der waals forces
To correct fluidity if too hot
Increase saturated fatty acids, maximize van der waals forces
Transport that does not need ATP
Passive
Transport that requires ATP
Active
Transport that does not require a transport protein
Simple
Transport that requires a transport protein
Facilitated
Movement of water from high concentration to low concentration
Osmosis
3 factors that determine how a molecule moves across a membrane
Charge, shape, and size
Ligand binds specific protein receptors on the cell surface
Receptor-mediated transport system
Simultaneous transport and chemical modification of transported substance
Group translocation
Main function of cell wall in prokaryotes
Prevent osmotic lysis
Pressure from water entering the cell causing the cell to rupture
Osmotic lysis
Hypertonic solution causing a cell to shrivel and die
Plasmolysis
Enzyme that breaks the bond between N-acetyl glucosamine and N-acetylmuramic acid
Lysozyme
Inhibits peptidoglycan synthesis
Penicillin
Stain purple and have a thick layer of peptidoglycan
Gram positive
Stain pink and have a thin layer of peptidoglycan and outer membrane
Gram negative
Structural polysaccharide in the cell walls of Bacteria
Peptidoglycan
Gram positive cell wall is blank percent peptidoglycan
90
Negatively charges molecule in gram positive cell wall that helps maintain the cell envelope
Teichoic acid
Lies between plasma membrane and cell wall of gram positive bacteria
Periplasmic space
Periplasmic space of gram positive is blank compared to gram negative
Smaller
Enzymes secreted by gram positive bacteria
Exoenzymes
Gram negative outer membrane is composed of
Phospholipids, lipoproteins, and lipopolysaccharides
Peptidoglycan is blank percent of gram negative cell wall
5-10
Blank connects outer membrane to peptidoglycan
Braun’s lipoproteins
Three parts of lipopolysaccharides
Lipid A, core polysaccharide, and O side chain
Another name for lipid A
endotoxin
Functions of Lipopolysaccharides
Contributes to negative charge, stabilizes outer membrane, and creates permeability barrier
Gram negative outer membrane is more permeable than plasma membrane because of blank and blank
Porin proteins and transporter proteins
Polysaccharide rich material exterior to cell wall
Gylcocalyx
Two parts of Gylocalyx
Capsule and slime layer
Dense, tightly attached, regular layer of polysaccharides
Capsule
Diffuse, loosely attached, irregular layer of polysaccharides
Slime layer
Regularly structured layer of proteins exterior to cell wall
S layer
S layer adheres to outer membrane in
Gram-negative bacteria
S layer is associated with peptidoglycan surface in
Gram-positive bacteria
Functions of S layer
Protects from in and pH changes, maintains shape, and promotes adhesion to surfaces
Short thin hair-like projections on bacteria and archea
Fimbriae or pili
Function of pili
Mediate attachment
Bacteria flagella
Thin, rigid protein structures
One flagella
Monotrichous
Flagella at end of cell
Polar Flagellum
One flagella at each end of cell
Amphitrichous
Clusters of flagella
Lophotrichous
Flagella spread over entire surface
Peritrichous
Three parts of the flagella
Filament, hook, basal body
Direct cell movement due to some stimulus
Taxis
Flagella rotate like a propeller
Bacteria flagella
Bacterial flagella counter-clockwise movement
Forward
Bacterial flagella clockwise movement
Tumble
Two parts of flagella that produce torque
Rotor and stator
Spirochete motility
use corkscrew shape
Movement that involves contact with surface
Twitching and gliding
Network of fibrous proteins in cytoplasm
Cytoskeleton
Functions of cytoskeleton
Role in cell division, protein localization, determine cell shape
Site of anaerobic ammonia oxidation
Anammoxosome
Membrane bound storage structures
Inclusions
Materials found in storage inclusions
Nutrients, metabolic end products, energy, building blocks
Not bound by membranes but compartmentalized for a specific function
Microcompartments
Example of microcompartments
Carboxysomes
Site of protein synthesis
Ribosomes
Bacterial and archaea ribosomes
70s
Eukaryotic ribosomes
80s
Archaea more similar to blank than blank
Eukarya, Bacteria
Irregularly shaped region in the cytoplasm where DNA is found
Nucleoid
Extrachromosomal DNA found in closed circular DNA molecules
Plasmids
Loss of plasmids
Curing
Complex, dormant structure whose function is to survive extreme environments for the organism
Bacterial Endospore
Bacterial endospore is resistant to
Radiation, heat, chemicals, and dessication
Endospore structure from outside in
Exosporium, spore coat, cortex, and core
Blank makes an endospore resistant
Calcium
Transformation of endospore into vegetative cell complex
Germination
Three steps to formation of a vegetative cell
Activation, germination, and outgrowth
Prepares cell for germination
Activation
Cell absorbs nutrients, spore swelling and rupture, loss of resistance, and increased metabolic rate
Germination
Emergence of vegetative cell
Outgrowth