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5 Written questions

5 Matching questions

  1. noncompetitive inhibitor
  2. metabolism
  3. phagocytosis
  4. competitive inhibitor
  5. tonicity
  1. a Cellular "eating"; a type of endocytosis whereby a cell engulfs macromolecules, other cells, or particles into its cytoplasm.
  2. b The totality of an organism's chemical reactions.
  3. c The ability of a solution surrounding a cell to cause that cell to gain or lose water.
  4. d A 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.
  5. e A substance that impedes the activity of an enzyme without entering an active site. By binding elsewhere on the enzyme, a noncompetitive inhibitor changes the shape of the enzyme so that the active site no longer functions.

5 Multiple choice questions

  1. Main energy source for cells.
  2. The diffusion of a substance across a biological membrane, without any input of energy.
  3. Energy available in molecules for release in a chemical reaction; a form of potential energy.
  4. A nonprotein molecule or ion that is required for the proper functioning of an enzyme. See also coenzyme.
  5. An 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.

5 True/False questions

  1. active siteThe part of an enzyme molecule where a substrate molecule attaches (by means of weak chemical bonds); typically, a pocket or groove on the enzyme's surface.


  2. thermodynamicsCellular uptake of molecules or particles via formation of new vesicles from the plasma membrane.


  3. pinocytosisCellular uptake of molecules or particles via formation of new vesicles from the plasma membrane.


  4. selective permeabilityA property of biological membranes that allows some substances to cross more easily than others and blocks the passage of other substances altogether.


  5. receptor-mediated endocytosisCellular "drinking"; a type of endocytosis in which the cell takes fluid and dissolved solutes into small membranous vesicles.