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Biology 202 chapter 27
Prokaryotes
70
Biology
Not Applicable
01/22/2005

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Term
Prokaryotes classification
Definition
Archaea (archaeabacteria), Bacteria (Eubacteria), Cyanobacteria
Term
Differences between Prokaryotes and Eukaryotes: Prokaryotes are
Definition
More diverse than Eukkaryotes, most abundant life form, Prokaryotes 3.5-3.8 billion years ago Eukaryotes 2.1-2.7 billion years ago,
Term
autotrophic
Definition
Are photoautotroph or chemoautotroph
Term
photoautotroph
Definition
uses photosynthesis to supply energy
Term
chemoautotroph
Definition
that obtains its nourishment through the oxidation of inorganic chemical compounds
Term
heterotrophic
Definition
Photoheterotroph and chemoheterotroph;An organism that cannot synthesize its own food and is dependent on complex organic substances for nutrition.
Term
photoheterotroph
Definition
An organism that depends on light for most of its energy and principally on organic compounds for its carbon.
Term
chemoheterotroph
Definition
An organism which oxidizes chemical bonds for energy but requires organic carbon compounds to grow
Term
Archaea and bacteria are important in many ways
Definition
industrial importance, antibiotics, genetic engineering, and they are the only organisms capable of atmospheric nitrogen fixation
Term
industrial creations from bacteria
Definition
acetic acid, vinegar, ethanol, amino acids, vitamins, enzymes, cheeses, yogurts)
Term
antibiotics from bacteria
Definition
streptomycin, neomycin, aureomycin, erythomycin, tetracycline
Term
genetic engineering benefits from bacteria
Definition
insulin, biological control, bioremediation
Term
stucture of prokaryotes: how many cells, size, nucleus or not?, cell membranes fxns,
Definition
single celled and colonial; no multicellular or specialization.....size 1 micrometer/ 10% of eukaryotic or smaller, no nucleus; single circular chromosome in cytoplasm.......cell membranes serve fxns of complex organelle; surface are for metabolic chemical rxns; photosynthesis, respiration, etc.
Term
bacteria's cell wall
Definition
secreted by cell membrane;
Term
2 general cell wall bacteria types
Definition
Gram positive-peptidoglycan.....or gram negative, capsule-gelatinous on outside
Term
3 basic bacteria shapes
Definition
bacillus, coccus, and spirillum
Term
bacillus
Definition
rod shaped bacteria
Term
coccus
Definition
spherical bacteria shape
Term
spirillum
Definition
spirally coiled bacteria
Term
peptidoglycan
Definition
polysaccharide molecules connected by polypeptide cross-links
Term
gram positive
Definition
peptidoglycan-polysaccharide molecules connected by polypeptide cross-links
Term
gram negative
Definition
additional lipopolysaccharide layer on outside of thinner petidoglycan layer
Term
capsule
Definition
in some cellwalls, gelatinous on outside
Term
flagella
Definition
one or both ends or all over in some; locomotion single fibers
Term
pili (pilus)
Definition
hairlike outgrowths; shorter than flagella; help attach to substrates and exchange genetic material
Term
endospores
Definition
thick walls around chromosome and some cytoplasm; dormant and survive aderse conditions especially heat and dry
Term
cyanobacteria (blue/green algae)
Definition
may from long filaments; galatinous sheaths; gliding motion
Term
bacterial reproduction
Definition
binary fission
Term
2 sources of variation
Definition
Mutation and genetic recombination
Term
mutation of bacteria
Definition
1/200 bacteria; may double in 12.5 minutes resistance to antibiotics
Term
Genetic recombination 3 types
Definition
transduction, conjugation, transformation
Term
transduction
Definition
virus genome parts incorporated into bacterial genome
Term
conjugation
Definition
The temporary union of two bacterial cells during which one cell transfers part or all of its genome to the other, hollow tube (pilus) forms between 2 bacteria; replicated plasmid transferred; small somewhat spherical, extra chromosomal DNA;
Term
transformation
Definition
plasmid genome absorbed from surrounding eviornment
Term
saprobes
Definition
decomposers, absorb energy and carbon from dead organic matter
Term
parasites
Definition
absorb nutrients from living hosts
Term
1.) Archaeabacteria... their cell walls lack- _____________, but have
Definition
typical peptidoglycan design.........distinctive membrane
Term
2.) Archaeabacteria...Lipids in- ___________, more similar to -_________; __________ are associated with DNA, have distinctive metabolism, they may also represent some of the oldsest life forms
Definition
phospholipids have distinctive rRNA, eukaryotes, histones
Term
Archaeabacteria are a diverse group some live
Definition
some live in habitats too extreme for most organisms
Term
Extremophiles
Definition
Eukaryotes in extreme environments consist of Methanogens, Thermacidophiles, and Halophiles
Term
Methanogens
Definition
produce methane from CO2 and H2; reduce sulfur to H2S; marsh gas
Term
Thermacidophiles
Definition
live in hot acid environments
Term
Halophiles
Definition
Organism that requires a salty environment Great salt lake and Dead sea
Term
Pathogens
Definition
An agent that causes disease, especially a living microorganism such as a bacterium or fungus
Term
plant pathogens
Definition
various blights, rots and wilts: appear as spots
Term
Human Pathogens
Definition
Lyme disease, Gonorrhea, Syphillis
Term
Lyme Disease
Definition
Carried by ticks; deer and field mice
Term
Gonorrhea
Definition
STD often resistent to antibiotics
Term
Syphilis
Definition
STD; several stages
Term
Syphilis
Definition
STD; several stages........1.)Chancre sore in infected area; highly infectious, 2.) General rash; sores in mouth and throat; still highly infectious, 3.) No symtoms, not infectious, 4.)Damage heart, nerves, brain, causes blindness
Term
Exotoxin
Definition
Proteins secreted by prokaryotes
Term
Endotoxin
Definition
components on membranes of gram-negative bacteria
Term
Koch's Postulates
Definition
(Robert Koch - German physician) guidelines for medical microbiology
Term
nitrogen fixation
Definition
the assimilation of atmospheric nitrogen by soil bacteria and its release for plant use on the death of the bacteria
Term
Aerobic
Definition
Living or occurring only in the presence of oxygen: aerobic bacteria
Term
Anaerobic
Definition
An organism, such as a bacterium, that can live in the absence of atmospheric oxygen
Term
Streptococcus
Definition
A round to ovoid, gram-positive, often pathogenic bacterium that occurs in pairs or chains, many species of which destroy red blood cells and cause various diseases in humans, including erysipelas, scarlet fever, and strep throat.
Term
staphylococcus
Definition
A spherical gram-positive parasitic bacterium, usually occurring in grapelike clusters and causing boils, septicemia, and other infections.
Term
decomposer
Definition
An organism, often a bacterium or fungus, that feeds on and breaks down dead plant or animal matter, thus making organic nutrients available to the ecosystem
Term
Pneumonia
Definition
An acute or chronic disease marked by inflammation of the lungs and caused by viruses, bacteria, or other microorganisms and sometimes by physical and chemical irritants.
Term
Anthrax
Definition
An infectious fatal disease of warm-blooded animals, can be transmitted to humans through contact with contaminated animal substances (hair, feces, or hides), and is characterized by skin lesions.
Term
Tuberculosis
Definition
An infectious disease of humans characterized by the formation of tubercles on the lungs and other tissues of the body
Term
Botulism
Definition
A severe, sometimes fatal food poisoning caused by ingestion of food containing botulin and characterized by nausea, vomiting, disturbed vision, muscular weakness, and fatigue.
Term
Cholera
Definition
An acute infectious disease of the small intestine, characterized by profuse watery diarrhea, vomiting, muscle cramps, severe dehydration, and depletion of electrolytes.
Term
salmonella
Definition
Any of various rod-shaped bacteria of the genus Salmonella, many of which are pathogenic, causing food poisoning, typhoid, and paratyphoid fever in humans and other infectious diseases in domestic animals.
Term
streptomycin
Definition
An antibiotic used to treat tuberculosis and other bacterial infections.
Term
neomycin
Definition
An antibiotic used as an intestinal antiseptic in surgery.
Term
Erythromycin
Definition
An antibiotic effective against many gram-positive bacteria and some gram-negative bacteria.
Term
Aureomycin
Definition
a yellow crystalline antibiotic used to treat certain bacterial diseases
Term
tetracycline
Definition
an antibiotic used broadly to treat infections
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