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5 Written questions

5 Matching questions

  1. facilitated diffusion
  2. active site
  3. cofactor
  4. active transport
  5. hypotonic solution
  1. a Referring to a solution that, when surrounding a cell, will cause the cell to take up water.
  2. b The part of an enzyme molecule where a substrate molecule attaches (by means of weak chemical bonds); typically, a pocket or groove on the enzyme's surface.
  3. c A nonprotein molecule or ion that is required for the proper functioning of an enzyme. See also coenzyme.
  4. d The passage of a substance through a specific transport protein across a biological membrane down its concentration gradient.
  5. e The movement of a substance across a biological membrane against its concentration gradient, aided by specific transport proteins and requiring input of energy (often as ATP).

5 Multiple choice questions

  1. Method by which organisms regulate solute concentrations and balance the gain and loss of water.
  2. Cellular "drinking"; a type of endocytosis in which the cell takes fluid and dissolved solutes into small membranous vesicles.
  3. In cellular metabolism, the use of energy released from an exergonic reaction to drive an endergonic reaction.
  4. The energy that matter possesses because of its location or arrangement. Water behind a dam and chemical bonds possess potential energy.
  5. The capacity to perform work, or to rearrange matter.

5 True/False questions

  1. competitive inhibitorA 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.


  2. heatThermal 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.


  3. diffusionThe spontaneous tendency of a substance to move down its concentration gradient from where it is more concentrated to where it is less concentrated.


  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. fluid mosaicA description of membrane structure, depicting a cellular membrane as a mosaic of diverse protein molecules embedded in a fluid bilayer made of phospholipid molecules.