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5 Written questions

5 Matching questions

  1. passive transport
  2. kinetic energy
  3. hypertonic solution
  4. energy coupling
  5. selective permeability
  1. a Referring to a solution that, when surrounding a cell, will cause the cell to lose water.
  2. b A property of biological membranes that allows some substances to cross more easily than others and blocks the passage of other substances altogether.
  3. c In cellular metabolism, the use of energy released from an exergonic reaction to drive an endergonic reaction.
  4. d The energy of motion; the energy of a mass of matter that is moving. Moving matter does work by imparting motion to other matter.
  5. e The diffusion of a substance across a biological membrane, without any input of energy.

5 Multiple choice questions

  1. Energy available in molecules for release in a chemical reaction; a form of potential energy.
  2. 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).
  3. A solution having the same solute concentration as another solution, thus having no effect on passage of water in or out of the cell.
  4. An increase or decrease in the density of a chemical substance in an area. Cells often maintain concentration gradients of ions across their membranes. When a gradient exists, substances tend to move from where they are more concentrated to where they are less concentrated.
  5. The movement of materials out of the cytoplasm of a cell by the fusion of vesicles with the plasma membrane.

5 True/False questions

  1. endocytosisCellular uptake of molecules or particles via formation of new vesicles from the plasma membrane.


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


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


  4. substrate(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.


  5. competitive inhibitorA 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.