Chapter 19 Notes Kingdoms Archaebacteria andeubacteria
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1 Chapter 19 Notes Kingdoms Archaebacteria andeubacteria
2 All bacteria are Prokaryotic. This means that they are organisms that are one-celled and do not contain a nucleus or other membrane bound organelles. Their sizes range between 1-5 micrometers. 1 micrometer = inches
3 All bacteria were once placed into the Kingdom Monera, but now are now divided into: Kingdom Eubacteria Cell walls contain a carbohydrate called peptidoglycan Cell membrane lipids differ from Archaebacteria DNA unlike eukaryote Kingdom Archaebacteria Cell walls do not contain a carbohydrate called peptidoglycan Cell membrane lipids differ from Eubacteria DNA similar to eukaryote DNA
4 Archaebacteria are ancient bacteria. They were the first organisms to appear on Earth. The three major types of Archaebacteria are:
5 Methanogens -(methane-producers) responsible for the production of methane, or Swamp gas, can be found:
6 Halophiles are salt tolerant and live in saturated brine and salted areas.
7 Thermophiles are heat tolerant and live in hot Springs and Black smokers (where hot gases are released into the bottom of the ocean).
8 Kingdom Eubacteria contains more evolved bacteria. Some examples of Eubacteria are: Nitrogen Fixing Bacteria Cyanobacteria Bacteria involved in Decomposition Bacteria involved in Food Processing And Bacteria that cause disease.
9 Nitrogen Fixing-fixing bacteria convert nitrogen gas into a form of nitrogen that can be used by plants. They are essential to the ecosystem and its food webs.
10 Cyanobacteria Cyanobacteria, originally called blue-green bacteria or blue-green algae, produce 20 30% of the oxygen here on Earth.
11 Pseudomonas is one kind of bacteria found in the soil. Bacteria recycle dead plants and animals by turning them into minerals and nutrients that plants can use. This is called decomposing.
12 Shapes of Bacteria Bacteria are classified based on a number of characteristics. One of these characteristics is their shape. Coccus (sphere) Bacillus (rod) Spirillum (spiral) Meningitis Strep throat Anthrax Botulism Whooping Cough Syphilis
13 Gram Staining (another method for distinguishing between types of bacteria)is determined by the composition of the bacterial cell wall. Gram Positive (peptidoglycan) Gram Negative (no peptidoglycan)
14 Bacteria can also be grouped into categories based on how they obtain their nutrition. Autotrophs can produce their own food given an outside energy source.
15 Chemoautotrophs use energy from chemical reactions in their environment to produce their own food. Bacteria from a Black Smoker Black Smoker
16 Photoautotrophs use sunlight as an energy source to convert simple compounds into complex compounds used for food.
17 Heterotrophs must obtain food from their environment. They do this by either Ingestion: an anemone feeding Absorption: a fungus absorbing nutrients
18 Bacteria can also be sorted based on their method of converting food into energy. All living things require energy. They must break down food to obtain it. This is done in different manners depending on the organism and the presence of oxygen in the environment. Bacteria can also be identified based on their methods of Facultative Anaerobes switch between cellular respiration and fermentation depending on the presence of oxygen in their environment Releasing Energy releasing energy. Aerobic Cellular Respiration requires oxygen (releases more energy, ATP) Anaerobic Cellular Respiration (also called fermentation) does not require oxygen and releases less energy.
19 Bacteria can reproduce asexually by binary fission or sexually by conjugation.
20 Rate of Bacterial Growth over Time
21 Phases of the Bacterial Growth Curve a. Lag phase - bacteria adjust to their environment b. Exponential growth phase - bacterial increase rapidly in number (binary fission) c. Stationary phase - bacteria reproduce at the same rate as cells die d. Death phase - bacteria die as their environment is contaminated and/or their food is used up.
22 Spore Formation Under unfavorable conditions, spores (vegetative reproductive structures) can form. These structures are resistant to harsh conditions, such as heat, cold, and drought and can survive for years. Given good conditions, they grow. Endospores are composed of a thick internal wall that encloses DNA and some cytoplasm.
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