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5 Written Questions

5 Matching Questions

  1. receptor-mediated endocytosis
  2. diffusion
  3. adenosine triphosphate (ATP)
  4. concentration gradient
  5. passive transport
  1. a The diffusion of a substance across a biological membrane, without any input of energy.
  2. b 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.
  3. c Main energy source for cells.
  4. d 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. e The movement of specific molecules into a cell by the inward budding of membranous vesicles. The vesicles contain proteins with receptor sites specific to the molecules being taken in.

5 Multiple Choice Questions

  1. 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. (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.
  3. The principle of conservation of energy. Energy can be transferred and transformed, but it cannot be created or destroyed.
  4. Referring to a solution that, when surrounding a cell, will cause the cell to lose water.
  5. Referring to a solution that, when surrounding a cell, will cause the cell to take up water.

5 True/False Questions

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

          

  2. potential energyEnergy available in molecules for release in a chemical reaction; a form of potential energy.

          

  3. coenzymeAn organic molecule serving as a cofactor. Most vitamins function as coenzymes in important metabolic reactions.

          

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

          

  5. osmosisThe diffusion of water across a selectively permeable membrane.

          

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