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5 Written questions

5 Matching questions

  1. selective permeability
  2. passive transport
  3. first law of thermodynamics
  4. heat
  5. cofactor
  1. a The diffusion of a substance across a biological membrane, without any input of energy.
  2. b The principle of conservation of energy. Energy can be transferred and transformed, but it cannot be created or destroyed.
  3. c A nonprotein molecule or ion that is required for the proper functioning of an enzyme. See also coenzyme.
  4. d 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. e A property of biological membranes that allows some substances to cross more easily than others and blocks the passage of other substances altogether.

5 Multiple choice questions

  1. The passage of a substance through a specific transport protein across a biological membrane down its concentration gradient.
  2. An organic molecule serving as a cofactor. Most vitamins function as coenzymes in important metabolic reactions.
  3. The study of energy transformation that occurs in a collection of matter. See first law of thermodynamics; second law of thermodynamics.
  4. 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.
  5. A solution having the same solute concentration as another solution, thus having no effect on passage of water in or out of the cell.

5 True/False questions

  1. phosphorylationThe transfer of a phosphate group, usually from ATP, to a molecule. Nearly all cellular work depends on ATP energizing other molecules by phosphorylation.


  2. tonicityThe capacity to perform work, or to rearrange matter.


  3. energy couplingIn cellular metabolism, the use of energy released from an exergonic reaction to drive an endergonic reaction.


  4. entropyThe capacity to perform work, or to rearrange matter.


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


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