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5 Written Questions

5 Matching Questions

  1. energy
  2. coenzyme
  3. osmosis
  4. fluid mosaic
  5. diffusion
  1. a The capacity to perform work, or to rearrange matter.
  2. b A description of membrane structure, depicting a cellular membrane as a mosaic of diverse protein molecules embedded in a fluid bilayer made of phospholipid molecules.
  3. c An organic molecule serving as a cofactor. Most vitamins function as coenzymes in important metabolic reactions.
  4. d The diffusion of water across a selectively permeable membrane.
  5. e 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 Multiple Choice Questions

  1. 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.
  2. A nonprotein molecule or ion that is required for the proper functioning of an enzyme. See also coenzyme.
  3. Cellular "eating"; a type of endocytosis whereby a cell engulfs macromolecules, other cells, or particles into its cytoplasm.
  4. (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. A property of biological membranes that allows some substances to cross more easily than others and blocks the passage of other substances altogether.

5 True/False Questions

  1. entropyA measure of disorder. One form of disorder is heat, which is random molecular motion.


  2. enzymeAn organic molecule serving as a cofactor. Most vitamins function as coenzymes in important metabolic reactions.


  3. concentration gradientAn 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.


  4. kinetic energyThe energy of motion; the energy of a mass of matter that is moving. Moving matter does work by imparting motion to other matter.


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


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