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5 Written questions

5 Matching questions

  1. feedback inhibition
  2. endergonic reaction
  3. pinocytosis
  4. exergonic reaction
  5. tonicity
  1. a The ability of a solution surrounding a cell to cause that cell to gain or lose water.
  2. b 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.
  3. c An energy-releasing chemical reaction in which the reactants contain more potential energy than the products. The reaction releases an amount of energy equal to the difference in potential energy between the reactants and the products.
  4. d A method of metabolic control in which a product of a metabolic pathway acts as an inhibitor of an enzyme within that pathway.
  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. The totality of an organism's chemical reactions.
  2. A nonprotein molecule or ion that is required for the proper functioning of an enzyme. See also coenzyme.
  3. The study of energy transformation that occurs in a collection of matter. See first law of thermodynamics; second law of thermodynamics.
  4. The principle whereby every energy conversion reduces the order of the universe, increasing its entropy. Ordered forms of energy are at least partly converted to heat.
  5. 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 True/False questions

  1. osmosisThe diffusion of water across a selectively permeable membrane.


  2. phagocytosisCellular "eating"; a type of endocytosis whereby a cell engulfs macromolecules, other cells, or particles into its cytoplasm.


  3. coenzymeAn organic molecule serving as a cofactor. Most vitamins function as coenzymes in important metabolic reactions.


  4. concentration gradientThe energy that matter possesses because of its location or arrangement. Water behind a dam and chemical bonds possess potential energy.


  5. diffusionThe diffusion of water across a selectively permeable membrane.


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