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Heterotroph
An organism that relies upon organic compounds for its carbon & energy needs.
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Autotroph
A microorganism that requires only inorganic nutrients and whose sole source of carbon is carbon dioxide
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Phototrophs
Microbes that use photosynthesis to feed.
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Chemotrophs
Organism that oxidizes compounds to feed on nutrients.
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Photoautotrophs
An organism that utilizes light for its energy and carbon dioxide chiefly for its carbon needs.
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Chemoautotrophs
An organism that relies upon inorganic chemicals for its energy & carbon dioxide for its carbon. A.K.A. chemolithotroph
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Lithoautotrophs
Bacteria that rely on inorganic minerals to supply their nutritional needs.
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Methanogens
Microbes that produce methane gas.
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Chemoheterotrophs
Microorganisms that derive their nutritional needs from organic compounds.
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Saprobes
A microbe that decomposes organic remains from dead organisms. A.K.A. saprophyle or saprotroph
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Parasites
An organism that lives on or within another organism (the host), from which it obtains nutrients & enjoys protection. Parasite produce some degree of harm in the host.
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Pathogens
Any agent, usually a virus, bacterium, fungus, protozoan, or helminth, that causes disease.
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Diffusion
The dispersal of molecules, ions, or microscopic particles propelled down a concentration gradient by spontaneous random motion to achieve a uniform distribution.
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Passive Transport
Nutrient transport method that follows basic physical laws & doesn't require direct energy input from the cell.
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Osmosis
The diffusion of water across a selectively permeable membrane in the direction of lower water concentration.
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Isotonic
2 solutions having the same osmotic pressure such that, when separated by a semipermeable membrane there's no net movement of solvent in either direction.
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Hypotonic
Having a lower osmotic pressure than a reference solution.
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Hypertonic
Having a greater osmotic pressure than a reference solution.
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Facilitated Diffusion
The passive movement of a substance across a plasma membrane from an area of higher concentration to an area of lower concentration utilizing specialized carrier proteins.
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Active Transport
Nutrient transport method that requires carrier proteins in the membranes of the living cells and the expenditure of energy.
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Group Translocation
A form of active transport in which the substance being transported is altered during transfer across a plasma membrane.
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Endocytosis
The process whereby solid & liquid materials are taken into the cell through membrane invagination & engulfment into a vesicle.
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Phagocytosis
A type of endocytosis in which the cell membrane actively engulfs large particles or cells into vesicles. Phagocyte-a cell specialized for doing this.
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Pinocytosis
The engulfment, or endocytosis, of liquids by entensions of the cell membrane.
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Symbiosis
An intimate association between individuals from two species; used as a synonym for mutualism.
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Mutualism
Organisms living in an obligatory, but mutually beneficial relationship.
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Commensalism
An unequal relationship in which one species derives benefit without harming the other.
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Parasitism
Parasite is dependent & benefits from host. The host is harmed.
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Biofilms
A complex association that arises from microorganisms growing together & interacting on the surface of a habitat.
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Binary Fission
The formation of two new cells of approximately equal size as the result of parent cell division.
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Generation Time
Time required for a complete fission cycle-from parent cell to 2 new daughter cells. A.K.A. Doubling Time
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Exponential
Pertaining to the use of exponents, numbers that are typically written as superscripts to indicate how many times a factor is to be multiplied. Exponents are used in scientific notation to render large numbers into small workable quantities.
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Growth Curve
A graphical rep. of the change in population size over time. This graph has 4 periods known as lag phase, exponential or log phase, stationary phase, and death phase.
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Lag Phase
The early phase of population growth during which no signs of growth occur.
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Exponential Phase
A period during which the curve increases geometrically. It will continue as long as cells have adequate nutrients & the environment is favorable.
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Stationary Phase
Survival mode in which cells either stop growing or grow very slowly.
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Death Phase
End of cell growth die to lack of nutrition, depletion of environment, & accumultaion of wastes. Population of cells begins to die.
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