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5 Written questions

5 Matching questions

  1. endocytosis
  2. osmosis
  3. substrate
  4. pinocytosis
  5. thermodynamics
  1. a The diffusion of water across a selectively permeable membrane.
  2. b (1) A specific substance (reactant) on which an enzyme acts. Each enzyme recognizes only the specific substrate or substrates of the reaction it catalyzes. (2) A surface in or on which an organism lives.
  3. c The study of energy transformation that occurs in a collection of matter. See first law of thermodynamics; second law of thermodynamics.
  4. d Cellular uptake of molecules or particles via formation of new vesicles from the plasma membrane.
  5. e Cellular "drinking"; a type of endocytosis in which the cell takes fluid and dissolved solutes into small membranous vesicles.

5 Multiple choice questions

  1. A transport protein in the plasma membrane of some plant or animal cells that facilitates the diffusion of water across the membrane (osmosis).
  2. The energy of motion; the energy of a mass of matter that is moving. Moving matter does work by imparting motion to other matter.
  3. Cellular "eating"; a type of endocytosis whereby a cell engulfs macromolecules, other cells, or particles into its cytoplasm.
  4. Thermal energy; the amount of energy associated with the movement of the atoms and molecules in a body of matter. Heat is energy in its most random form.
  5. Energy available in molecules for release in a chemical reaction; a form of potential energy.

5 True/False questions

  1. exergonic reactionAn energy-requiring chemical reaction, which yields products with more potential energy than the reactants. The amount of energy stored in the products equals the difference between the potential energy in the reactants and that in the products.

          

  2. concentration gradientA substance that reduces the activity of an enzyme by binding to the enzyme's active site in place of the substrate. A competitive inhibitor's structure mimics that of the enzyme's substrate.

          

  3. feedback inhibitionA substance that reduces the activity of an enzyme by binding to the enzyme's active site in place of the substrate. A competitive inhibitor's structure mimics that of the enzyme's substrate.

          

  4. tonicityThe ability of a solution surrounding a cell to cause that cell to gain or lose water.

          

  5. osmoregulationMethod by which organisms regulate solute concentrations and balance the gain and loss of water.

          

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