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17 Cards in this Set
- Front
- Back
____ are microbial populations anchored to one epithelial lining or another by stiff, sticky polysaccharides of their own making
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Biofilms
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____ ____ either passively let specific solutes diffuse through a membrane spanning channel in their interior or actively pump them through
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transport proteins
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The ____ ____ bind extracellular substances, such as hormones, that can trigger change in cell activities.
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receptor protiens
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multicelled organisms have _____ ____ that are unique identity tags for each species
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recognition protiens
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______ ______ help cells of the same type locate each other and remain in the proper tissues.
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adhesion protiens
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______ _____ form channels that match up across the plasma membrane s of two cells. They let signals and substances rapidly flow from the cytoplasm of one into another
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communication proteins
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A ____ _____ is a differnce in the number per unit volume of molecules (or ions) of a substance between adjoining regions.
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concentration gradient
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_____ is the name of the net movement of like molecules or ions down a concentration gradient
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diffusion
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An ____ ____ is simply a difference in electric charge between adjoining regions
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electric gradient
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A ____ ____ is a difference in pressure exerted per unit volume between two adjoining regions.
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pressure gradient
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_____ _____ is the action of the membrane allowing some molecules to pass freely though, and denying entry to others.
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selective permeability
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In ____, a molecule is transported into the membrane by the sinking inward to allow entry
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endocytosis
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In ______, a molecule exits the cell by a vesicle fusing with the plasma membrane, and the contennts are released to the inside.
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exocytosis
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Give two examples of active transport.
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calcium pump, sodium potassium pump.
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___ ___ is the mass movement of one or more substances in response to pressure, gravity, or another force.
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bulk flow
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_____ is the diffusion of water across a semipermeable membrane., to a region where the water concentration is lower.
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osmosis
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____ _____ is a solution with a lower level of solutes that the solution it is compared to
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hypotonic
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