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5 Written questions

5 Matching questions

  1. kinetic energy
  2. passive transport
  3. metabolism
  4. competitive inhibitor
  5. energy
  1. a The energy of motion; the energy of a mass of matter that is moving. Moving matter does work by imparting motion to other matter.
  2. b The diffusion of a substance across a biological membrane, without any input of energy.
  3. c The capacity to perform work, or to rearrange matter.
  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 The totality of an organism's chemical reactions.

5 Multiple choice questions

  1. 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.
  2. The movement of materials out of the cytoplasm of a cell by the fusion of vesicles with the plasma membrane.
  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. 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. The aerobic harvesting of energy from food molecules; the energy-releasing chemical breakdown of food molecules, such as glucose, and the storage of potential energy in a form that cells can use to perform work; involves glycolysis, the citric acid cycle, and oxidative phosphorylation (the electron transport chain and chemiosmosis).

5 True/False questions

  1. hypertonic solutionReferring to a solution that, when surrounding a cell, will cause the cell to lose water.

          

  2. isotonic solutionReferring to a solution that, when surrounding a cell, will cause the cell to take up water.

          

  3. 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.

          

  4. active transportThe diffusion of a substance across a biological membrane, without any input of energy.

          

  5. second law of thermodynamicsThe principle of conservation of energy. Energy can be transferred and transformed, but it cannot be created or destroyed.

          

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