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5 Written Questions

5 Matching Questions

  1. induced fit
  2. diffusion
  3. hypertonic solution
  4. feedback inhibition
  5. aquaporin
  1. a Referring to a solution that, when surrounding a cell, will cause the cell to lose water.
  2. b A transport protein in the plasma membrane of some plant or animal cells that facilitates the diffusion of water across the membrane (osmosis).
  3. c The change in shape of the active site of an enzyme, induced by entry of the substrate so that it binds more snugly to the substrate.
  4. d The spontaneous tendency of a substance to move down its concentration gradient from where it is more concentrated to where it is less concentrated.
  5. e A method of metabolic control in which a product of a metabolic pathway acts as an inhibitor of an enzyme within that pathway.

5 Multiple Choice Questions

  1. A protein (or RNA molecule) that serves as a biological catalyst, changing the rate of a chemical reaction without itself being changed into a different molecule in the process.
  2. The diffusion of a substance across a biological membrane, without any input of energy.
  3. A property of biological membranes that allows some substances to cross more easily than others and blocks the passage of other substances altogether.
  4. Referring to a solution that, when surrounding a cell, will cause the cell to take up water.
  5. The movement of specific molecules into a cell by the inward budding of membranous vesicles. The vesicles contain proteins with receptor sites specific to the molecules being taken in.

5 True/False Questions

  1. metabolismA transport protein in the plasma membrane of some plant or animal cells that facilitates the diffusion of water across the membrane (osmosis).

          

  2. 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.

          

  3. substrateA measure of disorder. One form of disorder is heat, which is random molecular motion.

          

  4. tonicityA measure of disorder. One form of disorder is heat, which is random molecular motion.

          

  5. kinetic energyEnergy available in molecules for release in a chemical reaction; a form of potential energy.

          

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