Pages 22 through 29 and chapter 4 Flashcards
Filament, hook, basil body, embedded in the cell wall and plasma membrane, phosphorylation event causes motion, run and tumble, in gram negative bacteria
Flagellum
1) Specific for attachment to surfaces 2) specific for conjugation
Fimbriae or pili
1) carbohydrate backbone consists of nag and nam 2) anchor for flagella 3) structure of Peptidoglycan in gram positive bacteria 4) consists also of side chain and cross bridge amino acids
Cell wall
1) multilayer Peptidoglycan (thick) 2) outside a the Glycocalyx 3) outside Of the plasma membrane
Gram positive
1) E. Coli 2) plasma membrane/ Peptidoglycan and outer membrane (cell wall) 3) would release too many toxins if you used antibiotics
Gram negative
1) disrupts Peptidoglycan synthesis (fission) 2) without Peptidoglycan cell walls are weak, results in rupture and death
Penicillin used to destroy bacteria
1) produced by eukaryotes and bacteriophage 2) hydrolyses Peptidoglycan bonds 3) Weakened cell wall results in death 4) found in tears saliva and sweat
Lysozymes used to destroy bacteria
1) etc location2) encloses cytoplasm 3) semipermeable depending on size, hydrophobicity, concentration gradient 4) enzymes for Atp embedded in membrane
Plasma membrane
1) Outermost covering of bacteria 2) excreted from inside the cell 3)slime layer (loose organization) 3) protects Bactria from host immune system
Glycocalyx
The passive movement of molecules from an area of higher concentration To lower concentration
Diffusion
Diffusion of water
Osmosis
The pressure required to hold water back
Osmotic Pressure
Same salt concentration, no net movement of water
Isotonic
Lower salt concentration, net movement of water into a cell
Hypotonic
Higher salt Concentration, net movement of water into a cell
Hypertonic
Requires expenditure of energy, moves substance against it’s concentration gradient, relies upon transport proteins in the plasma membrane
Active transport
1) exclusive to prokaryotes 2) substance is altered as it is transported across a membrane 3) alteration prevents passage back through the plasma membrane 4) example: glucose is phosphorylated so g-p can not pass back through the membrane 5) allows cells to sequester glucose in the cell
Group translocation
Fluid held within the plasma membrane, 80% water other 20% proteins, carbohydrates and lipids
Cytoplasm
No nucleus in prokaryotes, double stranded DNA circular chromosome), super coiled chromosome is attached to the plasma membrane at a single point
Nuclear area
Extra-chromosomal DNA, self regulating and self replicating, not required for survival, location of drug resistance, transferable
Plasmids
2 subunits of protein and rRNA, protein synthesis, 30s+50s combine to form 70s ribosome. In eukaryotes 80s ribosomes except for Mitochondria and chloroplasts (which are 70s)
Ribosomes
Streptomycin - gentamicin attack the 30s subunit
Erythromycin - chloramphenicol attack the 50s subunit
Antibiotics developed to disrupt prokaryotic protien synthesis
Storage areas in prokaryotes
Inclusions
Obligate anerobes, formed during stress, sporulation Results in formation of dehydrated cells with thick protective layer; resistant to heat, desiccation, radiation toxins, good for eons, spores germinate into the vegetative form of the organism
Endospores
